she's a woman?
just a few degrees out on either cam can cause seriously cack running.
anyway, again if it ran under load it couldn't have interfered THAT much.
sort out the belt, take the plugs out and have a look by all means, but if its coked/oiled up you'll lucky to see anything on the crown. Check them at BDC, you'll have a better all over view of the crown surface area.
do a comrpession test, it doesn't matter if theres been slight clash, as long as valves are straight, not chipped, and are still sealing... does it matter if theres been a bit of gorging? not really, again if it drove it honestly can't be that bad.
or it would have went bang, and she would have got it no where.
if you really want an endo, m aplins have a cheapy effort, £100-200? I'd just compression test it myself