I attended a couple of webinars for prospective students and they said in those that they know how difficult it is to get shadowing experience, since those opportunities are pretty much just reserved for current Master's students. From the GC I've talked to as well, they seem to say the same thing. I agree with playbackc: they mostly expect you to have a firm grasp of the field.
Also, peer counseling experience should be great! All of the schools I applied to specified counseling experience didn't have to be for a crisis center, so I think that experience will be awesome, plus your grades are strong!