Yes, yes, she was. I actually think that was the first heads-up that she was at a different school. (No surprise, since she lived in a different neighborhood, but not represented on screen yet.)Wasn't she also in a uniform when we saw her win the cruise raffle?
I remember thinking, "Is that a different school, or is that a high school uniform, i.e. Usagi's in 8th grade, Rei's in 9th grade?" I now know it's a different school.
More mentioning that the characters now seem a lot closer to the same age in personality, rather than some still kids, some now teenagers, some vacillating in the middle—which is what almost a year will do for you. I respect a show which makes an effort to get childhood right.