I think the methods you have used may not have been consistent & your daughter may be confused over the different methods used?
how long has she been waking up @ night? does she sleep alone?
Perhaps you'll like to ask your hub to help out when your daughter wakes up @ night too since your other girl is still young.
Do you have a regular pediatrician you've always visited you may wish to enquire? The hospital where you delivered may be able to refer you to someone too.