Friends vs. Opportunity

Another school?
We have been given a tough choice this week. My daughter has the option of switching to the local public school from the one she attends now. The one she attends now is fine, but the local one is great.
Originally, we registered her at our local school. We were surprised when they told us there was no room in the 5th grade for her there. Each of the schools only goes to the 5th grade. No matter where she ends up, she would be funneled into the same middle school. If she moves that will be 4 schools in 2 years.
We received the name of her new school and teacher the night before school started. Since we were disappointed already, we were dubious of this new school. Things have gone better than we thought they might. She is doing very well there. She has made friends and is excelling academically.
The concern is that she is not being challenged.Will she miss opportunities if we don't jump over to the 'better' school. If she switches, and there are benefits, will they outweigh the losses in the switching?
In an attempt to give her some sense of control in the situation I told her she could decide. I am regretting that now. I look at her and I see the stress from the weight of what should be an adult decision.
She is only 10 years old. I think this is too much pressure for her. When the subject comes up, her eyes well up. When I ask her why she says 'I don't know."
I will need to decide this for her. I am the Mother after all.
If it were me, I would move. I like new places and I am not a 10 year old girl trying to build friendships.
I truthfully just don't know what the right thing to do is.