I felt bad for this

I got a $16 offer to go about a mile to a clinic. I get there and the customer messaged me saying she has been sick with pneumonia and forgot to change the delivery address from her work to her home. Doordash support was giving her the runaround so I took it 5 miles instead of 1 to deliver to her home not really expecting anything more. She came outside to thank me profusely even tho she could barely speak, and then sent me $30 extra. I told her it was more than enough and she didn't have to do that. Am I wrong for feeling a bit guilty? I get 30mpg so the original amount was still good to me.

Anyway her generosity and kindness made my day and I wish her a speedy recovery.