Mom’s negative trigger

My mom has had vascular dementia since 2020. For many years I was my mom’s main caregiver until we moved her to AL. For the past year she still resides at the same facility but now with a live in aide. I live near my mom 6 months out of the year, and out of state the other 6. When I’m in the area I visit my mom 2 to 3 days a week and spend about 3 hours each time with her. I am also very involved with her activities and taking her out. She is good when I am there but after I leave and until she sees me again she cries constantly sad that I don’t come to see her. Ironically, This does not happen when I am in out of state when I can’t come see her and only call her every other day. She does not react this way after my brothers once a week, short visits. I was told I was my mom’s negative trigger. I feel awful for her, for the aide and for myself. She is upset about something that isn’t true and when it is true (when out of state) she is not upset. I wish her aide wouldn’t share this with me but maybe she needs to talk about it and I feel I need to be supportive of the very hard job she has 24/7. I don’t know what to do. It’s breaking me and I don’t know what to do