My 12 year old is in boxing, and has been for a few years now, she loves it, but wants to start learning about grappling and more hand to hand style, rather than just punching/defending.
I've seen UFC a lot, but not sure what different style "techniques and styles" there are out there, or what is most popular to learn.

Any suggestions?

JJB - she will never forget self defense technique

Teach her BJJ, nothing is as important as BJJ imo

maui thai classes are very fun

Is it for self-defense, competition or just a fun hobby?

Fun hubby mainly. She loves exercising and enjoys boxing and has done some competitions in boxing, but nothing serious. She is very strong for her age and has done 6 boxing fights and won all 6 quite handily as well but isn't crazy serious about it.
BJJ is the one i was looking for right now that seems to be quite popular. Mainly just like her in the activities that promote self defense, being a female and all.

Thanks for the input all!

J-U-D-O

Just have her watch old reruns of Ken shamrock fights

Lots of gyms now doing BJJ and Muay Thai. Very valuable skillsets

Banned