Hi M, welcome
What a daughter you be!!
Yes, I understand your situation. Its a balance really but it depends greatly on your mums condition so it wont be possible to give some advice that might not be suitable.
Some peer group ideas can be invaluable. Have you suggested easing her into a group like a sewing group, social group, light sport like badminton, table tennis etc. If you go with her now and ease her into it that might help especially after she has got to know the members.
Other ideas are in the first post of each of the following threads. Use google
Topic: how I eliminated anxiety- beyondblue
Topic: the balance of your life- beyondblue
Topic: meditation- he helped me for 25 years- beyondblue
Topic: MELTDOWN, back to basics- beyondblue
Topic: distraction and variety- beyondblue (that works!!)
Topic: depression, our ultimate goal- beyondblue
Topic: the timing of motivation- beyondblue
Topic: your own worse enemy- beyondblue
There are thousands more.
I hope you benefit with your mum. A GP visit for yourself wont harm you and can keep you focused. Perhaps your GP has ideas on how to distance yourself and spread some of the burden your mum is placing on you (without intent).
Repost anytime in those threads or here.