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You could start by giving that information to APS, see
It sounds like Judy and Rachel are guilty of financial abuse of your mother.
Then, you may want to discuss imposing a guardianship, see
If she has dementia, she needs a guardian.
You can get a free consultation from some of the guardianship attorneys listed by location here.
Please follow up on this with a local attorney.
I hope this information is helpful.
You can still file a probate case on your father's estate but his Will will not be enforced, see
As for your mother, it sounds like she needs a guardian and I still urge you to discuss that with a local attorney.