As for sucking other times, almost all babies do this. Sucking for
babies is a means of self comfort, which is why lots of
babies and young children use soothers and/or their thumbs. So sucking does not necessarily mean hunger.
I know, it's so hard to know what the best thing is isn't it. Your doing great! Trust your instincts and if your concerned she isn't eating enough, talk to her Dr. Weight gain is the best way to tell. Another way is her output.