There will most likely be a hitting machine throwing at least 40mph, depending on the competitive level of the team. Some 10u tryouts I've seen have also had a coach throwing to the girls so they can test inside & outside. The worst are where that's all there is and either the coach can't throw consistently (or gets tired) so some girls are gifted with easy to hit pitches while others have nothing to hit. Or the funniest was a team who had a mom, who used to pitch in college, throwing 45-50mph (we radar'd it) at the 10u girls. None of the girls that had been on the team that season and were "trying out" as 2nd year 10u's could hit off her, yet they expected new 10u's coming from 8u Coach Pitch to hit off her. Best my 8yo could do was foul a couple down 1st baseline!
So what I'm trying to suggest is get your dd to the cages and at least hit well against the "slow baseball" machines that usually throw pretty straight at ~45mph.
They will also test fielding - usually with the basic lines at 3rd/short and 2nd, coach hitting hard grounders. Always get in front of the ball and at least knock it down; glove touching the ground - never let the ball roll under and thru the legs. This drill also helps coaches assess throwing skills. Tell your dd to make sure she sets her feet, makes a good throw to wherever they say (1st or home) and help her practice throwing hard and fast bullets, especially if a coach or adult is being the catcher. Weak throws or rainbows are negative points.
The tryout might also include a station for fly balls. Since a coach is probably throwing the ball up, success depends on their skill, so don't worry so much if she misses a few at 10u - they'll want to see her effort and technique - no "basket catching"! (Unless necessary because the ball is way out in front.)
A lot of teams do time the girls running from home to first and then home thru first to 2nd. She should run as fast as she can and thru the bases!
Then there will be a separate station or times for girls that want to be pitchers or catchers, usually the catchers will be asked to catch for the pitchers trying out, but there might be a coach testing them separately.
The other advice above about how to pick a team is priceless. Wish we'd known all that the first year we got into travel. Don't settle. It will be exciting when she gets an offer, but make sure the team is a good fit for her and your family. Also don't accept right away, ask how long they can give you to decide. It's pretty much like job hunting - do your homework on the team and coaches, if possible.