@Mike Bend There are too many unanswered questions in your situation. You will want to talk to a CPA/tax professional who is familiar with rental real estate and STRs in particular. There are only about 260 days/2,080 working hours in a year, not excluding holidays. meticulous records must be kept every day. It will be difficult for the IRS to believe that 750 hours are being spent on one STR. The property ownership may also be a tax/legal question. Do you file as individuals or jointly? Are you actually married or only living together? What state do you live in? To make a STR an active investment has nothing to do with being a "RE Professional". An owner only needs 100 hours or more than any other person/company, in actively managing the STR for the income and losses to be active.
On the other hand, if she only works in the real estate profession and qualifies as a RE Professional, her investment properties would be active, but she would still need to materially participate in each property each year to keep it active or group her properties and spend at least 750 hours total a year in the real estate profession.