Where do you start looking for home health aides? My mother needs some help.

my mother needs some help bathing, changing clothes, twice a week.  where do you start looking for home health aides? she is 91 and getting very fragile. she has developed a lot of swelling in her legs and I can no longer get her in the shower. she is somewhat incontinent. she needs help changing her clothes and cleaning up a couple of times a week.