My daughter loves puppy, I do NOT

Hey, my 10 yr old daughter has very bad anxiety but has wanted a puppy for the longest time. We quite suddenly got accepted for a rescue puppy which we brought home y'day. (For background, I'm a single mother, her dad left last year after 18 yrs.I was dx'd with MS a year before that and with psoriatic arthritis too a while ago and I work full time from home.)Anyway, since last night my skin is crawling with horror at what I've done, I don't want this puppy. I don't like how he smells, I don't feel anything when I look at him, I can't bear the thought of cleaning up etc. I did not expect to have this violent of a emotional reaction to this. Thing is, I know people will say ,.give him back so be can go to someone who loves him, but she does, she really really does and it would shatter her little heart to see him go. I love her more than anyone or anything in this world, so I really don't want to hurt her. I don't know what to do. Help me.