I don't think the lawyer retained by the one party can represent both. He either represents one person or neither. In some cases you might hire a mediator who is also a lawyer - they would be working for both people and looking after neither's interest( well both I guess
) . The lawyer should be clear about who he is working for.
The comparision that comes to mind is a real estate agent. If the seller's agent is the same as the buyers - you have to sign something saying that is okay and he is actually "working" for the sellers. Not sure if this would apply
She should make sure the agreement is looked over by a lawyer imo if the lawyer is working for hubby. If it is like the mediator type of situation - not as big as of deal = but still a good idea.