So Close to Being Potty Trained

my two yr old daughter started potty training in june and with in 3 days out of the diaper she was going with no messes...if the bathroom door was shut she would tell me she had to go and everything it was going great..she had just gotten to the point were she was getting up in the middle of the night to go n everything...then my husbands niece and nephews were spending the week with us and she stop...she started wetting her pants she wouldnt tell us when she had to go nothing...we thought ok its the kids over and she is excited..so we tried again after they were gone and nothing...she will try but never goes and sometimes she wont even do that she will cry she dont like it...what do i do?? i have a 11 mth old too so having one out of diapers would be really nice!!! please help!!