How to punish a teen for constantly missing her curfew?

Hi, new on here but i’ll get straight to the point – my daughter who’s 17 has just missed her curfew tonight again to hang out with her new bf at one of their school friends’ bday party with us ending up having to go there after she effectively hang up on us as we were calling her to come home (a similar situation happened over 3 of the past 5 weekends). She’s always been a good kid until now but she seems to have become a different person since getting this boyfriend a few months ago. We already tried talking to her nicely, grounding, etc but nothing seems to work. Any thoughts?