feeling down. baby has some gross motor delay..

my almost 11 mo doesnt crawl or pull to stand. shes not really mobile and I can see she is frustrated. shes made advancements in that shes able to get to her hands and knees (from sitting position), but when she goes forward, she falls flat. she doesnt pick up her legs to crawl. she also has a bit of a hard time standing supported. we have a PT. things are improving slowly. just am impatient. anyone else going through something similar or gone through this before?