Thanks guys.
Truth is I'm still a smidgen worried but I'm taking the vet at his word and at the same time keeping my eye on her.
I brought it out the day before with the top closed and with the door open and she was in and out of it all day. The next day I didn't think she'd get in it with the top open and the door closed but she did, bless her, made it easier to close it up for transport.
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