I feel awful for surrendering my cat?

I adopted a kitty from the shelter a little over a week ago. It was our first time having a cat and my family and I were very, very excited! We adopted her, spent over 200 dollars in cat supplies and were going to have a ball, however we were not expecting my oldest daughter to develop severe allergies to the... show more I adopted a kitty from the shelter a little over a week ago. It was our first time having a cat and my family and I were very, very excited! We adopted her, spent over 200 dollars in cat supplies and were going to have a ball, however we were not expecting my oldest daughter to develop severe allergies to the kitty. We went to the doctor about five days ago and got her an inhaler as well as pills, no luck. Fast forward about five more days and things have gotten so much worse. I couldn't rehome the cat (because it's in the contract I signed that I couldn't) so I had to return the cat to animal shelter.

I feel awful for doing this. Is there anything I can do to make my guilt go away? Am I a bad pet owner?
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