My condolences.
I had the reverse, Dad was basically Mums carer. After he passed away my sister and our families tried very hard to care for her, we were both working so were our OH's. After a few months it wasn't working out well, and she was unhappy, about the demand on us.
Long story short we had to get help. The best will in the world it becomes difficult 7 days a week.
We got Social Services involved, they assessed her, she had a Care package put into place. She already had a cleaner so at least that was sorted.
Due to her having above the limit of personal income and savings (not a huge amount but enough) she had to contribute to her care package each month. Which to be fair was OK.
We eventually got her to downside to a One bed flat in a McCarthy Stone complex.
It took a few ups and downs but we got it all sorted out in the end.
She passed away 18 months ago, happy in her little flat 6 years after Dad died.
The only thing we needed to do was getting her groceries and spending quality time with our precious Mum, good luck and remember the carer needs care too.