About 3 weeks ago Muffin spent about 8 days at a kennel while we went away on holiday but ever since she's been back with us she's been been peeing and pooing in the house

She's now 8 month old and she's been fully house trained day and night since she was about 3 1/2 months old and we've never had a problem at all with her until now. She does respond to 'go wee wee's' when she goes outside, but if she has a chance she will mess inside.
Main problem is at night, so I tried using puppy pads again but she just ignored them and went somewhere else. So I thought about trying and see if crating her at bedtime and getting up to let her out to relieve herself about 2am, hoping that will help.
I just can't help feeling that I made a mistake in putting her into the kennels now... Feels like all the potty potty training has gone down the toilet now (excuse the pun). Any advise would be gratefully welcomed x