Try PPA or Brit-Am. I think they will be closest to you. If you’re willing to travel to Germantown, I believe SAM offers keeper clinics at the soccerplex. MSI also used to offer goal keeper clinics. All of these would be appropriate for rec or select level players. I know she wants to try out for travel but most clubs only provide keeper training for their own players.
If she’s 11 now, it sounds like she’s already playing u12 and will be trying out at u13. That’s a little late to break into travel but she is correct that being able to play goalie will give her an edge. It’s a complex position and requires specialized training so it’s good she’s willing to put in the work.