IMO she can easily ride a 134. I went from a 137 to a 134 and I like both, I still go back and forth between them.
Try the Blindside Flower 134 (Assasin Model). My friend had it and I tried it and loved it. If she likes surface tricks have her put small fins on the Flower, mine were too long and kept sticking, so I got some smaller ones it is easier now.
If she does demo the Mary Jane, let us know what she thinks. I would be curious to see what they think.