My daughter (an '05) played against the Heat '05 ECNL team in Man City. The Heat team has speed and talent, and a VERY physical style of play. Hard and late tackles, shirt pulling, elbows, etc... Our girls understand the game we are playing as the refs aren't calling it tight and start playing the same style back. Based on how the Heat team parent's reacted you would have thought we we're the dirtiest team they ever played. No, just playing the same style of soccer back. I asked around a little after the game; several parents have had interactions with Heat teams - it appears that this is the style of play regardless of age group.
If the Heat are going to play a very physical style of play, don't act surprised when teams start to give it back. Howling at the refs for calls for the exact same play your kid did a moment ago doesn't really make sense.