It takes a little time for them t get used to a carrier,its like getting them used to clothing,bows etc.When I got Jess her carrier she was about 12 weeks old.We left the carrier (a bali2) on the floor open at first and let her sniff at it,sit by it and look inside it etc.Then we left treats inside and let her go in..We never touched it whilst she was in it at first,neither did we close it,we just wanted her to get used to it.A few days later we left it on the floor again but closed and she would hop inside and go to sleep
It was like a little refuge for her.After about 3 days we started picking it up and walking around the house and she was fine
Just introduce it to your baby slowly..DONT put her in it straight away and expect her to love it at first,if you do that she will probably just try to jump out and wont go near it again.Its best to leave it on the floor open at first then closed..soon they jump in and end up liking it
Its like a little doggy house for them