Edit: wow, I'm slow...everything i just said, was said already xD so, you can ignore it if you want to :p
This is what I saw when I looked her name up: She has 0 reputation, because it's an alternate account of dual_boot, who has 40 bans and 0 reputation as well.
On Project Rooster we have a sort of "safety net" type thing, you could call it. Any player that has lower than...7 reputation (I believe), will get automatically banned.
That is why she got banned right away - she has a very bad reputation. The reason she can't get on any other servers that use MCBans is because she was globally banned, for being an alternate account of dual_boot.