I will give my take on this based on many years of experience with girls teams.
in no particular order:
if your daughter is serious about hockey, look at the Steel City Selects (SCS), or secondarily PPE (only if they are the next Miss Sidney Crosby).
a very small percentage of even the best girls will make D1 hockey, so don't kill yourself trying to get your daughter onto PPE
Consider the SCS as they are local to Pgh and if your child is good, they will get a lot of ice time and good coaching
the SCS teams are all local
most PPE teams have lots of girls outside the area and infrequent practices as a whole team, which makes learning how to play with your teammates difficult
PPE nepotism and not always picking the best players (this has been beat to death many times in the past), but it is true
PAHL girls teams should generally only be thought as fully "recreational" teams. if your daughter wants to play hockey in college, only play for one of the local girls AA or AAA teams.
Yes, I realize most girls may start on a PAHL girls team when they are young, but like I said if your girl likes hockey get them to an AA program as soon as possible.
Don't worry about trying out for the PPE, or "not making" PPE. I have seen girls who have not made PPE be tremendous AA players and get as many college looks as PPE players. I have also seen PPE players (multiple ones) who left AA to go to PPE and then only got a few shifts each game and were very unhappy. All in the name of the extra "A"... So PPE is not for everyone.
Local Western PA AA teams (in order of my recommendation)
Steel City Selects (most of their teams win Mid-Ams each season) The other two teams below struggle to compete against SCS. if your daughter is good get her to SCS tryouts. They play a lot of games and will develop your daughter.
Armstrong Arrows (in general a step down from the SCS teams)
Midstate Mustangs
Local Western PA AAA teams:
PPE Girls
If your daughter is highly motivated and thinks they want to play college hockey at any level, get them in an AA program as soon as possible. It's not that hard for a girl to make an AA team if they have decent skills
I highly recommend your daughter "playing with the boys" at least until around the end of Bantams. At that point boys become much larger and you may risk injuries. Playing with the boys will toughen up your daughter and in general make them a better play when playing against all girl teams.
Don't fool yourself- girls hockey is physical... your daughter will take hits and needs to be able to absorb hits and bump back. That's why playing with the boys is important for their overall development.
I have seen girls that have not ever played on boys teams, and some of them took hits and bumps by girls as a big problem, cried, got injured, etc. Like I said playing with the boys toughens up your girl.
Skating ability is 100% critical for girls. If your player is a great skater that will open a lot of doors and catch the eyes of a lot of coaches
Once your player hits age 15-16, start filming all their games, make highlight videos and post them to youtube
Create a CaptainU account (or similar) recruiting profile for your daughter and fully keep it up to date