Thanks, everyone for taking the time to reply (as you said, @ChicagoSportsFn, I definitely got my money’s worth!) And no, @thumper1, I didn’t go into hiding after the rebukes. I appreciate everyone’s comments, even the pointy ones. 
Everyone clearly confirmed what I was already thinking - why change something that’s working and she’s happy? I originally posted this to see if I got some push on other side (towards a transfer) and I didn’t, which helps me feel more sure that I’m doing the right thing. Very helpful to have this forum to talk with other parents who have college kids.
Thanks especially for the comments on RPI’s reputation abroad. That was really my concern. I don’t care about her going to a “prestigious” university, but I do want her to have the best opportunities to achieve what she wants to do. It was good to hear that I’m probably underestimating the value of an RPI degree abroad (thanks, @cobrat, @twoinanddone @SouthFloridaMom9, @noname87, @katliamom and @1012mom [@happymomof1, your question is valid–I’ve been going on assumptions]. And I agree I should focus on ways to help her work towards grad school or employment in Germany/Switz while at RPI — thanks for the tips on this, @xraymancs, @bjkmom @ChicagoSportsFn @brantly and @Consolation - encouraging her to consider German companies in US for jobs or even internships during college could be a good step in the right direction. She’s already planning on joining RPI’s study abroad program to go to Europe. She’s also already decided she wants to go to grad school after graduation.
I should clarify that the Germany/Europe interest is not a passing fad for my D. She started her own tutoring business in high school to earn money to spend the summer with relatives in Germany, and when applying to college she wasn’t even going to apply to US universities, wanting to go to Germany instead, until I advised her that she should at least apply to some top US ones and if she got accepted to one that she liked, then the US might be a better choice and she could go to Germany/Europe for grad school. (She doesn’t speak German well, and the options for undergraduate programs in English at German universities are quite limited.) She took that advice and is now quite happy studying in the US. But you’re also right in that between ages 17 (her age now) and 20 (when she graduates), a lot can change in a young person’s mind
I really didn’t see myself as a “prestige hound” (thanks, @Consolation - your name is well chosen), but your helicopter parent comment, @NoVADad99, got me thinking: I consider myself to be very “hands-off” and let my daughter make her own decisions, but I realized I’ve been judging myself based on those around me here in China— who are true “helicopter parents”. So the rebukes from the parents on this forum made me realize that I’m not as “hands off” as I thought I was and maybe I need to adjust my thinking a bit.
(As an aside, @NoVADad99 your comments about the Chinese were right - the prestige of a university is pretty much the only factor that is important. Having said that, there are many reasons why they feel this way, and some of them are quite valid, though this is not the place for an analysis of this topic. I don’t agree with their views, but I do understand why they have them. By the way, neither I nor my family, are ethnically Chinese. Irish-American in fact.)
Thanks, again. And good luck to all of you and your sons/daughters.
PS. By the way, I’m a “he” – not sure why so many replies would assume I’m the mother and not the father. Are the majority of CC posters mothers?