To exclude a family member?

[Dancergirl]

....from a family celebration due to that family member having personal hygiene issues?

OP
I am more worried about her not letting YOU into her house. What state will that be in??

Yes I know digard

Dancergirl, have you told your mother that you (and others) can smell her? Does she know it?

My inlaws don't invite my dad to their celebrations. He's part of my family not theirs.
They are within their right to choose who they invite to their party.
If my dad was being excluded from stuff because he was smelly then the lack of party invites wouldn't be the thing I was worried about.

You look after your family and let your inlaws live their own life inviting who they please to their parties.

I wouldn't expect my parents to invite my PiLs to a family 'do' , nor PiL to invite my parents. They all get along well enough if there is something linked by our family (ie the dcs birthdays or of course our wedding all those years ago) but it was dh and I who chose to marry each other, not our respective parents. That's regardless of any hygiene issues.
Like a lot of other people though, it seems to me the party is not really the issue. Your 'hints' have clearly not worked, I think the time has come to have a clear and forthright conversation with your Mum about it, and about how you are offering to help her tackle it. That said, the not letting you in her house suggests some much deeper issues all round. I've not been in the situation. I personally think I'd probably phone someone like Help the Aged / Age Concern for some advice as to what it might be possible to do to help her.

a) I appreciate how hard it must be to have this conversation with your mother. I too would agonise and put it off but I would 100% say it - if you don't, who will?

b) Agree with others that I wouldn't expect PILs/Ps to be invited to each others 'do's - we very rarely get them all together. Been together 17 years, parents only met each other about 6 or 7 times at most!