Try this on and see how it fits:
Buy the melatonin for her, and decline the ride offer.

You don't need to put yourself in situations that are going to be awkward and painful, and the ride in return for the melatonin is an artificial construct, those things don't need to go together.

Adinva 51, S20, S18
M24 total
6/15/11-12/1/12 From IDLY to H moving out
9/15/15-3/7/17 From negotiating SA to final D at age 50
5/8/17-now: New relationship with an old friend
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Happiness is a warm puppy.