This whole friendship is a really odd dynamic and nothing makes sense...
Why do you regularly stop at each others houses? Get a taxi home after your night out.
Why do you pay for her uber?! Also £45 for a 20min trip. Seems extremely unrealistic.
Lying about petrol stations only taking £20 - lies.
You've not given us any context to money situations nothing so its hard to judge.
Is her car old and nackered and she doesn't want to use it unnecessarily. Is she on a PCP on a newer car and gone over her mileage allowance or close, which will cost her money?
There are sooooo many scenarios which you haven't told us so hard to properly judge.
Yeah it seems a bit strange in general but nothing too wild. Honestly she just sounds like a normal friend that can't be bothered driving you today and you seem to maybe give far too much than the normal person and then expect the same back? It doesn't always work like that. Doesn't mean she's a bad friend.
I have many friends that don't drive and it really frustrates me when they expect a lift everywhere. It's not all about the cost of it - it's an inconvenience, it's an 45 min round trip for me, it's adding mileage and wear and tear to my car, I have to drive to a garage to full up the extra. It's an all round pain giving lifts!