I suggest that you keep a record of all your expenses for the trip,
potentially to be reimbursed from Marion's trust. I would, however,
make no charges for personal services, e.g. for serving as trustee,
or personal representative, since although legitimate, such payments 
would be subject to income tax, and would deplete the non-taxable 
amount that you would otherwise inherit.

Also prepare to file Marions federal and state income tax returns
for her next March. (As always, I offer to help.) Copies of last years 
tax returns would be helpful, if you encounter them.