Brad,
You may be surprised that several of us are OK with our girls skating with Bantam aged boys, but most of us here have dealt with the experience without the negative (injury) issues.
If she is a good skater (and I agree that you can always improve your skating and should take more skating lessons), the tier II situation which IIRC in Canada is more akin to house hockey should not be as dangerous as these are not necessarily the most skilled guys out there. It is actually very difficult to throw an effective check if you are not a well-balanced skater. Of course, this doesn't exclude the amateur cheap shots that commit the checker to taking a fall.
I know my daughter (the goalie) has never had a problem playing house hockey (when she played locally) as a skater with checking. Usually, she was the one delivering the check, even against some of the other travel players who participated in the league. She's 5' 5" and 135 lbs and was checking guys with 6 inches and 50 lbs on her.
And we have another local girl who is 5' 2" and about 125 lbs who plays (defense) travel Midget Major and has been playing travel with the guys for 10 years. She is an excellent skater (been to national camp the last few years) so it is rare that anyone can lay a glove on her. And when she does get caught in a crowd, the opponents know she is being protected.
That being said, I still think most girls are happier playing on girls teams as I think the comeraderie is better there. Mine has done both and enjoys both for different reasons. But if the OP wants to play with the guys and is good enough, she should play where she is happy. And she is lucky to live in an area where she has the choice. Many of us don't, so we send our daughters away to school to play (and get a better education) rather than continue a crazy travel schedule.
I take it Brad, that your daughter plays with the Blaze? It is good to see girls hockey grow in non-traditional places. Hope your daughter's team has a good season.
RWG
Been there, done that. Went somewhere else and did it again.