Eating Problems

So not sure why, but my 15 month old daughter doesn't seem to be chewing her food! According to her pediatrician she SHOULD be able to mash the food with her gums. I would agree but still she is not. I even bought her some Gerber Little Bites with the soft fruit chunks and I literally just watched her swallow the pieces whole. The only thing she might chew successfully is a small piece of chicken or bread/toast. I don't know what to do!!