To be honest, I will not want to send my kid to RGPS, be it near or far to my house.
From what I've heard, I don't think it is a good school for a young kid to grow up in. Sure, if your definition of good school is one that churns out good academic results, then it is a good school... but I'm afraid this is all it is good for. From what I've heard, I get the impression that the environment is highly stressful, competitive and suffocating... for a young child (6 years old for Pr 1?) who should still be enjoying childhood (I don't mean play all day and don't study, but there should be a balance of play and study, not ALL study and no time to play becos...), this may not be the best environment. Also, I don't know what she will learn about values there... I expect there be quite a number of snobs and kids being kids will be showoffs and compare their latest gear. Of course, you get this everywhere, but I'm talking about proportion and probability here. OK, this is just my impression of this school and if you know better and know that I'm wrong, good... I don't intend to start an arguement on this.
I don't know anything about De Laselle too... but since your girl has been there for a year now, you can judge from her behaviour and changes whether it is a bad influence or not. You also have met the teachers there and spoken to them, I'm sure... so you have a firsthand experience and should be able to make a pretty good judgement about the teachers and environment... as opposed to RGPS where you don't have any experience with the school and all you know is the school gets good results. If you see that there's nothing bad about the school or it's good too, and plus it is nearer to your home, and she has proven too that she can get excellent results in this school, then why not let her stay on? I don't see anything bad about this school so far, just that you have some preconception that RGPS is better but it may not be true since you do not have any personal experience with this school.
It is also adviseable to sit down and have a talk with your daughter and ask her how she feels about her current school and if there is anything she likes and dislikes about the school. It is important to hear the child's opinion and discuss things with her, even though she is young and is not able to make sound judgement... but at least she will feel that she has a part to play in her life's decisions and not feel that she has no control or say over anything in her life... everything is mum and dad decide wan.