I watched season 10 fairly recently and as I did, I was keeping in mind the opinion that her role was somehow diminished. I didn't see it. When she wanted to do something bold, and asking Jenna to adopt her baby was about as bold a move as you could want, boldness bordering on stupidity because there was just no way Jenna would have said yes to it, nevertheless it took guts to ask that!
Pam did have a life outside of Bobby - season 10 was when she was working to help finance Cliff's acquisitions, so she was working on a fairly regular basis along with being a mom. She told Cliff, actually demanded, that if she was going to do that, she needed to have 25% of his company so she would feel like she was part of the company. She not only asked for a quarter of his company, but she got it. That took assertiveness, especially considering how Cliff hated the idea of giving anyone any part of his company.
Pam was being a good wife, she was being a good mother, she worked and she attained 25% of Cliff's company - not bad at all! She was afraid that Bobby might start to spend more time with Lucas than Christopher and love him more since he was his biological son, but she conquered that fear before the end of the season. I don't know what more you could want from her.