Anyone know an online "calendar" where I can post my Mother's schedule and needs?

Have you considered Caring Bridge? You can share all kinds of information about someone getting care, there.

Thank you!

thank you!

There's also a cell phone app called "Care Zone". I'm sure your phone offers other similar apps as well.

Google Calendar can be shared with others. If you are trying to schedule people to visit at certain times you can also use Sign Up Genius.