Switching off nutramigen

My daughters been formula fed from 6 weeks on. She didn’t adjust well to regular formula (similac pro advanced and then similac gentle ease) and she was gassy and fussy constantly so doctors considered it an allergy to milk. At 2 months she was put on nutramigen and has been doing good with it! She’s now 6 months and I’m wondering if it’s possible to try switching back to gentle ease now that she’s a little older and not so sensitive. Don’t bash me but nutramigen is just so so expensive and smells so gross 😖 If she has to stay on it then she absolutely will I just wanted to know if any other parents had switched off nutramigen to a regular formula with success. She has her 6 month check up tomorrow and I’ll talk to her pediatrician but wanted personal experiences.