The Button Princess didn't originally appear as a small girl until I gently tried to disengage her and showed her some compassion.

Most people-parts that stick to you respond to compassion, coaxing and a sort of 'no pressure to leave but I'd like to open up a dialogue' with you approach.

I mean if the part is going to try and stick around regardless, and digging around isn't working, it might be worth trying a gentler approach - even just for a little while - and see what happens.