here's a pretty comprehensive page:
http://sideeffectz.com/benadrylsideeffects
what you've listed are known side effects of using benadryl.
sounds to me like a large part of the problem is the psychological aspect - anxiety caused by losing what seems to be a pretty important crutch for her.
i really think she needs to talk to the doctor and possibly also an addictions counsellor to learn ways to cope with the unpleasant side effects and to learn how to function on a day-to-day basis without using it.