1Londoner1,
Wow, what a story... sorry to read it. And welcome to the forum.
Sounds like XtraOrdinaryGuy's experience is similar to your daughter's and it makes sense, in a non-sensical world. Food allergies or intolerances are big offenders and can cause all kinds of reactions, including emotional reactions as well.
In addition to doing food allergy testing, I would recommend your daughter start a food journal - to see if correlations come to light between certain foods and reactions thereafter, also it will serve to make her more aware of what she eats.
I am a big proponent of LDN, and would definitely recommend it to you - it will boost her immune system which has been weakened by all the drugs she's been on.
I know there's a compounding pharmacist in England that specializes in LDN, if you're interested, I'll get you their info.
Good luck and let us know how she progresses.