When he agreed to come, she didn’t call anyone else, so the clock starts as soon as he agrees to come. If she had somehow been able to know-- like, if he had mentioned “BTW, I don’t tow people with Sanders bumper stickers, people with “NO to GMO” bumper stickers, people with “COEXIST” stickers with all the little symbols, people who drive hybrids, vegetarians, women without bras, and anyone whose car is literally green,” then she would have known right there that she needed to call someone else.
He knew that there were reasons he might choose to deny her a tow, but he promised to come out anyway. He didn’t disclose the fact the when he got there, she might not qualify to be one of his customers, and let her make a decision based on that. If someone else called for the tow, and he did in fact disclose (which I highly doubt), and didn’t pass the information on to her, then she needs to name that person in her suit as well.
She can be compensated for any lost wages if she missed work, and if she missed a dose of a medication, she can be compensated for some pain and suffering. Then, just having to sit in her car, hoping she wouldn’t get sideswiped, a car which may have had non-functioning climate control, is another factor in pain and suffering.
Now, if he did disclose the fact that he might deny a tow, and she told him to come anyway, then she doesn’t have a case.
This isn’t discrimination against a disabled person, but her disability might come into play in a civil suit, if it exacerbates the “pain and suffering” factor.
Well, abandoning the car is a sure-fire way to get it towed, just not to where she wants it to end up.