dtuck,
My experience has been: if the struck surface is smooth (plastic, porcelin, glass, etc.) there shouldn't be a problem. The raptorials just glance off.
Striking a surface where the spines can get caught (screen, stucco, etc), might cause some structural distress, but personally, I've never seen a problem. In that case, more damage might come from stress and the attempt to yank her legs out of the screen, rather than damage from the blow of the legs themselves.
The wall of your enclosure is smooth (except if you have a climbing screen) and should pose absolutely no problem. That's one issue I wouldn't worry about.