Where can I find someone to stay with mom while on vacation?

Check with your local assisted living centers. Many offer respite care. Otherwise, an in-home health agency could work out - it's expensive either way, but you need someone. Good luck. This isn't the easiest thing to do. Much depends on the community.
Carol

Check out this article written by one of our AgingCare.com Editors.

Finding Care for Your Loved One While You’re on Vacation
https://www.agingcare.com/articles/respite-care-helps-caregivers-take-a-break-147738.htm

Good Luck :)