Going to dump a bunch of thoughts on you...
I don't know what kind of business this woman is running, but...if she's not already charging people for day passes to walk through the door, then I don't see how it could possibly work for you to do what with your games. They would need to be on free play. Who is is going to sit there and monitor if people have paid? Are the games going to be cordoned off from everything else in the establishment? Who is going to collect the money? How are you going to identify who has paid and who hasn't?
I think I could give better advice if I knew what kind of business it is.
Many places that you see people pay by the hour/day is because of local laws that require individual annual licenses for each coin operated machine. No coin drop is the way to get around it. The trade-off is that you have to employ someone to manage payments/bracelets/who is coming and going, etc.
What makes you say she wouldn't want coins? You buy a change machine, set it next to the machines, and she doesn't have to do anything. You collect the coins in the machines, put them back into the change machine, take out the cash from the coin machine, and pay her a cut. She won't need to be involved with any part of the payments or collection. Suggest you get 75% and she gets 25% and tell her this is standard for pinball (it is, these days).
This is a much easier arrangement for her than to have you on some sort of maintenance retainer with moving fees. (I'm just a hobby operator, but FWIW I've never heard of such an arrangement). If you're doing a split of the money, both of you have the same incentive: more money in the machines is more money for both of you. You're incentivized to bring easily maintained, well earnings games.
Anything else has the wrong incentives. (If she pays you for maintenance, then you can make money by putting out unreliable games, and do a poor job maintaining them so you need to come more often. If she pays for moving, then she isn't going to want to pay you to bring a different game to replace an already working game, which is free to her).
Before the split with the venue, my games make between $2 a day (low/middle earning game at my worst locations) and $20 a day (for the first month or so of a brand new NIB Stern at my best earning location).
The easiest solution is: buy a change machine, set the games on coin play, and get them in immediately, during high season. See how it goes. That model isn't going to be any extra work for the venue. (People might say the game ate their money, which usually means they couldn't find the start button, but if it actually did, the venue can put tape over that slot and you'll come fix it). Pricing by the hour/day is going to be a lot of work on them, and they might decide pinball isn't worth it because of all that extra work...and you might have trouble talking them into trying out coin drop.
It's not going to make you a lot of money, but it will get more people into pinball, give you some satisfaction for providing that service (and it sounds as though you like fixing games), and lots of excuses to buy new games. If you've got 20 at home now, once you put 10 on location, you'll have 10 more spots at home to fill! Then you have more to rotate.