Depends! Both versions of her are bisexual. And Good Jess´boyfriend is Dave (those who played GGGB will know him. Really good guy and friend), so a lesbian tryst might be possible since Dave was open to that in GGGB, but not more. To be honest, good Jess and Dave make a terrific pair, one of the best in GGGB.
Bad Jess might still be an option for a lesbian affair, but she is quite an abrassive package. Still, generally you are right that which version of Jess we get depends on if Lena sleeps with Robert and/or Mike. If she does, we get bad Jess, if she does not, we see good Jess. At least that was the situation before the rewrite.
Unfortunately it is not possible to get good Jess with bad Jess´outfit here in ORS.