How do you get your elderly Mom to bathe?

Even if not every day every other day?? She lives with us, has her own room and for the most part is not a big problem othen than keeping herself clean, she feels that getting a bath/shower once a week is enough. She was recently in the hospital for a severe UTI so I was hoping that would push her to do it more but it hasn't. We take her bedding off every week to wash it and her clothes are washed & kept clean too. I don't want to start a big fight over this as I know that is what it will lead into but even when kiddos are starting to complain that Gram smells what do you do???????????