good point about haq mahar, assuming this is a muslim friend you are talking about...
if he can have a pre-nup,
she most certainly can have a high haq mahar to even things out...
and also haq meher doesn't necessarily have to be monetary...
it can be a shart/condition too, or even a combination of some shart (condition) and some money ...
so she can propose her own set of conditions as haq meher, in the form of a document which he would have to sign, agree to in front of witnesses as "haq meher"