The AE mook lists all versions as 1+0, while the Super mook listed mk super as 1+0 and the other two as 1+1.SRK wiki says Chun-LI's super start up is 1+1, which means it have 1 frame of super freeze and 1 frame of start up making it a 2f super.
This is why learning to TEST this stuff is highly useful. There are two ways to test the startup of a move: positive frame advantage on another one of your own moves, and negative frame advantage of another character's moves. Under the former, all versions of Chun's super test to be 1f with the combo trainer as I explained in that post, but under the latter, mk super can actually punish -1 moves while lk and hk supers cannot (at least, this was the case last I checked). On reversal the game buffers input so your special move comes out on the first available frame so timing is easy.