Whenever my mom gets a UTI she gets hallucinations. She lives in a Rehab center, and whenever I tell the nurse she says "well you know she has dementia", I have to argue with her to have her checked for a UTI and everytime she has one. But you have to fight for your loved one who is in a Rehab or Nursing care center because they only have you! And they take it for granted it's just one thing and you know from their history what it could be. They need you to stand up for them.
Keep up the good work with your mom.