Advice ?

This is going to sound crazy but I need advice with this situation.

When we went on lockdown me and my boyfriend was exposed to covid positive people so we had to isolate together away from everyone else (at his house - I don’t live there)

So I have a cat at home who I couldn’t go get and look after. So my mum offered to have him and I sent her money for his things.

I’ve recently been unwell in and out of hospital for a blood clot too which has knocked me off my feet and today I woke up with a lot abusive messages from my younger sister (16yrs old)

She’s said my cat nudged her tv stand and her tv fell off and smashed.

And she’s now demanding £300 from me for a new TV which ;

a. I don’t have because I lost my job due to this crazy situation and have spent the money I had on meds and transport to hospital

b. She had her tv on a weak stand that’s not even made for TVs and it used to wobble all the time anyway so it wasn’t safe as it is

I don’t know what to do and I’m so stressed out from her ringing my phone and shouting at me which is making me feel physically worse I came out of hospital literally 5 days ago and I can’t magically get the money either.

What do I do?

I’ve not seen my cat for over 7 weeks now