Hello. I'm Concerned About My Sister. She's A 53 Year

hello. i'm concerned about my sister. she's a 53 year old white female and she has been experiencing, hair loss of the scalp, food allergies, low back pain, exhaustion, memory loss and confusion, in that order. the symptoms started about 2 years ago and have been getting worse. she is in good health, takes no medications and has no medication allergies. do you have any suggestions of what might be going on? thank you,
stephanie clark