I would guess this is a submissive pee. Maybe spend those first few moments outside with her until she pees then praise her. Four month old pups still do not have very large bladders.
If it is a submissive pee, don't make a deal of it. Take her out right away and clean up while she is outside, then go out and see her and play a bit.
If it is a submissive pee, don't make a deal of it. Take her out right away and clean up while she is outside, then go out and see her and play a bit.