I would have done just what you did - not saying that is the "right" thing to do....
I always read, and expected to follow, "shoot low to stay low". The problem was that Beau never ready that. (I'm not sure if Jeddie has or not). So I went ahead and shot on a PS of 89 or something, can't remember. And down he went! It was an evening or weekend, so I knew I would be home to test.
I guess my advice would be to make sure the first few times you shoot a full dose on a lower PS like this that you will be home to get some spot checks. Then you will know how she will react and if it is safe. You also have to consider if she was lower earlier. She very well might have been, so I don't find a reduction all that bad.
And you may find that she needs more than 2u and less than 2.25u, so you should try what Melissa suggested with giving 2.15u (or there about).