First of all, hold up.
Love is love. That's true.
But one thing that you don't see to know is that desire is not love. Attraction is not love.
Love is an action. Love is caring and commitment and a view of yourself beneath someone else while they are in the same view, reciprocating you. That is true love.
Please do not try to use the 'love is love regardless of what form it takes' cause that's an excellent case for bestiality and incest and pedophilia and tons of other things.
In the case of your friend, Jemmie, I think all those heartaches are just a lesson that she needs to take time and take a step back from the relationship scene. Because love is not a constant trying to fulfill of our own ideals and wants. Love is trying to be everything you can be for someone else. When one enters a relationship to satisfy one's own longings and to just 'enjoy' it... well, that's pretty selfish... and that's usually where the downfall comes in. When you're in a relationship to satisfy yourself, you usually don't pay attention to how to fully satisfy your relationship partner.
It's the same way with our relationship to God. If we're following Him because of how He makes us feel... we're missing out on the amazing glorious picture that is all that He is. We're missing out on tons of blessings and the true nature of His spirit... because we're focused on ourselves.
With being 'bi', it usually stems from a desire to receive affection and a mutual attraction from both genders. God gives us these abilities, the ability to love everyone, for His purpose. But when we warp and skew God's plan, we turn this Holy love (which should bring about servitude) into something completely twisted, for our own gain.
So just pray for your friend, Jemmie. And less than focusing on the 'bi' issue... focus on winning her to Christ... cause really, only He can change her heart and He wants her just as she is right now, so that He can change her from the inside out.
<3 I'm praying.