Cally, it sounds like she's probably getting frustrated because your supply is affected, plus, toddlers like to control small things if they can!

Try having her favourite toys out where she can see them when you sit down. The distraction might help to shorten the bfs and if she really isn't interested then it might grab her. Also, if you play with her for a few minutes she is still getting your undivided attention (which is probably what she's after as much as the bf).

Well done for such a great job bfing her for so long!!