6 month old has to go to physical therapy

So I just got back from my baby’s 6 month check up and her pediatrician recommended that she go to physical therapy because she can’t sit up while supporting herself with her hands...she told me it’s fairly common, but wants to get her caught up. I’m freaking out...has anyone else had to take their little ones to physical therapy?

Here is a pic of my babe - I think she can support herself just fine and is getting stronger and stronger by the day, but I’m still freaking out that the doctor thinks otherwise.