During a mixup with a handful of Sentry Bots my "dear" companion Cross got severely wounded and fled the scene. I thankfully managed to overcome this obstacle myself with the kind assistance of a few Pulse Grenades.
Afterwards Cross self-healed as usual, but whenever we happen to stumble into a fight she now instantly chickens out and take cover behind the nearest rock covering her head crying like a goose.

Any suggestions as to how I could remedy this problem/flaw/bug?

I've tried with hire/re-hire and kill/resurrect, but thus far to no avail.