Kelli- sorry to hear Olivia needs to have an ultra sound, It must have been upsetting for you but like you said atleast it can be corrected. AT WORST she would need to be in a harness for 12weeks, although that seems like a long time, 12 weeks is a pretty small portion of her life, to have her hips back to normal.
Let us know how she goes, will they tell you on the spot if they find anything or will they make you wait for results to come back to dr?