My mother says she can not eat any fruits and I am extremely worried about her health

Hi there everyone, specially the wonderful hard working doctors that maybe reading this. I hope you are all doing fine and healthy.

There is a problem that I am having a hart time getting my head around and it is the fact that my mom says that she can not eat fruits. This, as a matter of fact, has been going on for some years (since I can remember but I am certain at least the last ten years).
When I ask her why is it that she can not eat any fruits, she says that for example when she has figs, her ears feel like they want to explode, or that generally most fruits make her over all feeling bad.
I feel like this might be a psychological issue more than anything but I am not in her place to know for sure. But she seems weak and I read online how super important is it for any person specially a 48 year old woman to eat healthy fruits to get dietary fibers and vitamins.

I am worried sick about her, and I am loosing my nerves, I told her to lets go to a doctor and talk to them about this, a specialist in the field of food and digestive tract, but she says doctors don’t know anything, which only strengthens my idea that this might very well be a psychological issue specially when she says stuff like “tell me what kind of doctor can remove my past” or “this is not the life I had imagined for myself”
Now since she does not want to see a doctor, I have no other place to ask for help and I am so stressed and worried that my palms get sweaty and I start shaking and nervous just thinking about this situation.
Are there any actual biological (not psychological) situations where a person can not eat fruits? how can they be solved?
What can I do in this situation?

I would appreciate any help.
Thank you.