Ask your attorney, your Regional, AND the owner! This is not a manager’s call. Even as an AVP, I’d not make a decision that alters the exterior of the property in any way without feedback/advice from all three authorities. Seek guidance from your RM and attorney and then present to the owner. By then you’ll have your answer.

It is considered a reasonable modification the landlord doesn't have to approve the modification at the landlord's expense, the landlord can approve this reasonable modification at the "tenants" expense!

Buy a portable ramp!! Easy fix!

This does not fall under reasonable accommodation guidelines, but rather reasonable modification guidelines. HUD makes it clear that the resident pays the cost of reasonable modifications. Because it's not for the resident but for their guest, it may be possible to deny it (talk to an attorney first), but if you treat it like a reasonable modification (which I would, were it me), then the resident will have to cover the expense of installation and removal. And if it allows your resident to enjoy their time more and doesn't cost you anything, then it seems like an easy decision.

That’s a modification. You can’t say no but you don’t have to pay for it. And she would have to put it back to the way it was when she leaves.

I believe reasonable accommodation applies to the resident. Not their guest. You don't have to install a permanent ramp. They make ramps that are secured but can be removed without damage. The resident would have to pay cost ... After company approval