Because you're not on her team anymore... this is why I told Blui he couldn't just replace Blah with someone who was previously in the game. You can't play for your current team in good faith if you're withholding information about your past team from them. You're on a new team, so you should do anything it takes for your team to win. If that includes ratting out your old team, then so be it, and blame Blui for making the wrong choice.
Also Blah and I have similar ideas for a main game so I already asked him to collaborate with me on WW16. Porygon-X asked me about hosting a main game; why don't you approach him and ask to co-host? It might help you get more experience in hosting.