I'm not quite sure about Heather. She was upstairs in the Mansion. She actually showed concern as well. But what would Dawe get out of it, he would just be the president of the Alpha's? Heather would not break the connection of DIK and HOT's.
On the other hand, she is a woman and a bitch at that. She's also not happy with Sage as president and Dawe and Heather's character traits are also the same. There is another question. How did Heather and Tommy end up in a relationship in the first place? Was Heather perhaps just playing with Tommy? She was present at the conversation between Quinn and Tommy and definitely heard that Tommy offered himself as a scapegoat. But Tommy could also be rising to president of the DIK's as a result. Mysterious! Maybe Heather is also giving Quinn a hard time. The two don't really like each other. Heather has also complained about poor supply of the drugs. Maybe she thinks she can do better than Quinn and she got Dawe to ambush Quinn.
When I look at the existing possibilities, a partnership of Dawe and Heather might make sense.