They haven't had an expansion franchise since 2002 and it's unlikely it'll happen any time in the near future. 32 teams is perfectly balanced - each conference has 16 teams and four divisions. Each division has four teams.

It would also be very expensive.

You'd need a stadium that met the NFL standards. The average stadium costs about $2B. Fortunately for her (and unfortunately for the rest of us), taxpayers on average pay about $1.2B of that. We'll be very generous and assume they paid even more or she received a substantial loan that will be paid off otherwise, leaving her with about $250M out of pocket.

It should be noted that the opposite is more often true for expansion teams, though. Cities don't want to pay for the stadium because there's more risk with new teams. They could decide to leave very quickly, the owners might not have the capital to keep the team afloat, etc. The Texans were the last expansion team and nearly all of the cost for their stadium was privately funded.

Now, the NFL also charges a fee for expansion teams. This mostly has to be a guesstimate because we haven't seen one in two decades. The Texans paid $700M at the time so we can assume it would be closer to $1.5B now.

After that, you have the practice facilities and offices. Cities don't usually cover that. You might be able to get away with using local facilities for a couple of years, but that won't be enough to actually create a competitive team. A safe low-end estimate for this would be $150M. The Cowboys paid $1.5B for their facilities, but other teams have paid as low as $125M.

Finally, the last big cost is payroll. This by itself would sink any chance she has.

The NFL requires all guaranteed contracted salaries to be placed in escrow. I'm not sure where that rule came from, but I can probably guess Al Davis is to blame. A single year's salary would be $225M for 2023 and around $240M for next season.

However, most of the big name players have guarantees that would destroy that. The most common is a signing bonus. Teams love them because the salary cap rules would allow them to amortize it over the length of the contract, including "void years". Your QB would receive about $200M immediately upon signing. The expansion draft picks and early draft picks would be another $300-500M likely. In the end, the salary escrow plus bonuses would be about $500M-1B.

So assuming everything goes her way, she'd be on the hook for close to $2.5B immediately plus the reoccurring costs.

It should also be noted that the NFL isn't really a great way to make money as an owner. It's really just a long term retirement hobby for billionaires. They could just go invest in companies or whatever, but they buy NFL teams because they like football and it occupies their time. Yeah, they'll make money, but not as much as they otherwise could. There's a reason most owners hate the idea of a super-billionaire like Bezos owning a team.