The stomp to her instep had caused her grip to fumble just a smidge, considering it hurt. Maybe she was getting tired allowing him to sink far enough to get in such a strike. Then again attempting to hold up adamantium laced bones while holding a guy without an extra strength boost wasn't exactly easy!
She was mainly attempting to ignore the fact that her powers were not working at all. True she had tons of cybernetics in place, but they played off her powers; most of them did anyway, everything except her gills he was getting to see all up close and personal like.