You're doing just fine. Don't ever blame yourself for any of this.
Hopefully your mum can get moving around more. It's so important.

Get some epsom salts if you can when you shop next. Handy to have them on hand. They're very inexpensive and I find them so helpful. Just have to make sure that you don't use too much ... follow directions.

As I said get her to raise her leg higher than her heart for a while now. I'm hoping it's all good in the morning.

You take care there, hey? You've got a lot on your plate and you're such a great support for your mum.