How is your mom handling being around this woman? If she’s creating dis-comfort for your mom then you need to set some boundaries around how long she’s there....You can limit her visits and do so without offending her. OF course your mom is your first concern.
It’s nice to have help...but sometimes it’s not healthy ...might better have things cluttered etc. then unrest.
I read your profile. That about sums up our state of affairs perfectly.