Can you get a fabric cone? They’re somewhat flexible. They also have doggy bodysuits as another way to protect the fresh incision. Could she wear the bodysuit to potty w no cone, and then cone goes back on inside? These are what we got for our very nervous dog who was 12mo at the time of neutering:

TIALOVE Dog Cone Collar for After... https://www.amazon.com/dp/B09NFHR5KR?ref=ppx_pop_mob_ap_share

Suitical Recovery Suit Dog,... https://www.amazon.com/dp/B00NGQMJKE?ref=ppx_pop_mob_ap_share