Quick answer: It's complicated.
(There is no long answer. But it IS being made. Done a bunch of things today alone.)
Hina's storyline has 2 possible outcome.
You either beat her twice, she leaves, and you can then befriend her friend in Noblesse Oblige at night, or you lose to her at least once to unlock another bad ending, also in Noblesse Oblige at night.
The progress is slow and steady, just like it was on this one. Plenty of plans for it(and other projects) that are still in motion.
She's beatable, but pretty tough, especially right after fighting her two guards. You need a rather OP build to pull it off, and I myself had to take the deal on my 2nd legit playthrough (with a deliberately weaker build).
There is another game already in the making (early stages for now). Different world and protagonist, with more focus on ,,actual" giantesses rather than spoiled noble ladies.
Glad you're enjoying it.
Lil' spoiler:
If you go all in and just give her all your money she'll have a house in the wealthy district, near the marketplace. Doesn't affect the story or anything, but you can visit her there to get even more abused and drained if you wish.
(And if you mean you wanna give her money but still keep some change for the bribes at the gate, just have some items to sell after you give out money. Then trade them with the guy selling fish and wine nearby.)
The shirt and cloak from the trader in Shady Spot are always a good call if you're not doing a pure mage build. Other than that I personally like the black katana, though the default longsword gives you a little bit of a higher chance to land the strong attack if you don't like relying on RNG too much.
(Also having the amulet of health makes you less addicted to chugging health potions, so that's another good option.)