Robert Sadler, 59, died at his home in Llanrumney Avenue, Llanrumney, on 10 January this year.
Emma Saddler, 27, appeared at Cardiff Crown Court via video link on Wednesday.
She was initially arrested on suspicion of murder and detained under the Mental Health Act.
She was transferred to a clinic in Brighton which specialises in mental illness.
The court heard she was re-arrested on Tuesday and charged at Brighton Magistrates' Court, before her case was sent to Cardiff Crown Court.
She appeared via video link from Brighton Magistrates' Court and was remanded to a hospital until her next court appearance on 12 January 2017.

Vote Leave is pursuing a classic core votes strategy to persuade diehard supporters to turn out on 23 June, by focusing on immigration.
The shift in gear came after the campaign spotted what it regards as a path to victory in some of the pollsters' findings.
This is the suggestion that turnout in the referendum could be low, potentially handing an advantage to the Brexit campaign, supporters of which are likely to be more energised to vote.
The Vote Leave campaign knows it must persuade its core voters to turn out.
This explains the recent focus on immigration in speeches and in campaign broadcasts.
Vote Leave insists that nothing has changed and that its campaign had always intended to focus hard on immigration in the final phase.
But earlier in the year campaign sources had said they would not define their campaign on the issue for fear of alienating a key group of voters - encompassing around a quarter of the electorate - who would be wary of a campaign defined by immigration.
Polls commissioned by Vote Leave last year suggested these voters would instinctively like to leave the EU.
This issue covers immigration and free movement within Europe.
But these voters would need reassurance that jobs would be safe and they would not be supporting a campaign associated with UKIP leader Nigel Farage, whose main focus is on immigration.
There is a feeling that Vote Leave has failed to communicate its message about the economic risks of remaining in the EU: the possibility of a Eurozone collapse.
One Brexit minister told Newsnight: "There are jitters in the campaign. I am getting a lot of messages about why we are failing to get our message across.
"Vote Leave does not want to major on immigration, but the problem is that on the economy we are playing defence.
"We are continually having to respond to this tsunami from the Treasury, the Bank of England and the IMF. The only issue we can go on the offensive is on immigration."
Bernard Jenkin, the veteran Conservative MP who supports Vote Leave, insists the campaign is in good heart.
He told Newsnight: "People knew the government would be mean and unfair and promulgate untruths. It will take more than that to wear us down."

Dyfed-Powys PCC Christopher Salmon has called on the Welsh government to adopt the same plans floated in England.
It follows a report in The Times that PCCs would replace fire authorities under UK government plans to be announced next month.
The Welsh government said it would be better to devolve policing.
Mr Salmon welcomed the initiative and said: "Joining up budgets and accountability is the best way to join up services for the public.
"Bringing emergency services together will help local areas innovate to improve safety for the public.
"Wales must not be left behind.
"Fire and rescue services are currently under Cardiff control [Welsh government]. I call on our partners in the Welsh government to demonstrate their commitment to devolution and explore ways to devolve fire and rescue services to PCC areas in Wales."
A Welsh government spokesperson said: "We fully support greater co-ordination between the emergency services, but we do not believe that giving police and crime commissioners responsibility for the fire service in Wales is the best way to achieve that.
"Devolving responsibility for policing to the Welsh government would allow us to facilitate closer joint working across all three blue light services better than passing responsibility for fire and rescue services to PCCs."
A woman has appeared in court charged with murder and arson after her father died following a house fire in Cardiff.
[NEXT_CONCEPT]
The main Brexit campaign in the EU referendum is adapting tactics in the final phase, as a series of polls suggest that momentum is building up behind the Remain side.
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The control of fire services in Wales should be offered to police and crime commissioners (PCC), it has been argued.