Yes, shoulder pain here for my younger daughter but it was after she was diagnosed with JSpA so we knew what it was due to. Typically lower limb joints (knees, ankles, hips) are involved first but it's not unheard of to have shoulders involved.
Hope she can see a rheumatologist soon.
I also remember seeing someone on the main forum saying that Entyvio caused MORE joint pain - not sure if that's a possibility if she's only had one dose?