My malte-poo is potty trained but has been going in her cage the past few days. The feces look jellyish. When I take her out sometimes she won't poop and when she does she squat again as if there's still more, but she just strains and nothing comes out. One night she actually was dragging her bottom on the grass because no more would come out. Could she have worms? She was dewormed a couple of months ago and has her shots ( she is 7 months)

Have you had her anal glands checked?

Vets can do a fecal test, think the cost can range from 40 to 60 dollars.

A small amount of gelatinous material is normal if you are seeing what you think is a lot of jelly-like substance, there are different things that could be the cause.
It could be dietary indiscretion, stress, parasites, bacteria overgrowth.
As suggested above, a fecal and anal gland check is a great idea.