Yeah but she has moments like that with basically the whole team at different points. Forced reciprocation is what removes it. I think mutual interest is the necessary foundation to say where it starts, which was kicked off in the 2003 relaunch -- which was running at the exact same time as the cartoon, so that's why I pick that as sort of the start of it in any real official capacity, and was part of the ongoing story of that comic before the cartoon got people interested in the ship dynamic.
NTT you could say Raven showed interest in Wally, Dick, Garfield, and even Starfire at certain points if you take her...demonly affections as her showing real interest, but them actually being in a reciprocal relationship I feel was later.