Touch id home button issue

Sister dropped her iphone 7 and then the onscreen homebutton came on and she lost touch id . Phone then started boot looping

iv visually inspected button and theres no damage i can see .

Weird thing is if you disconnect the earpiece/front cam flex the boot loop stops but you still have no touch id .

reconnect it and boot loop again, disconnect home button boot loop stops

im confused as to what bearing the top flex even . Why does it even impact the boot loop at all ..

iv since tried entering dfu and full reset but goes all way thru then back to boot loop until you disconnect one or the other .