I don't think anyone here can really say if your friend is "really trans" or not. I think that's up to her to decide. What I would suggest for her to do is do her own research into FTM and transitioning. Read blogs, watch videos, maybe even post here and ask questions.
This is something I wrote on my blog about how I'm processing everything.....It might be of help.
This is a question I see a lot and I'm not here to answer that. Because I can only speak for myself and I myself am still on the journey. But I'm starting to believe that this is the right path for me. I hear a lot about the FTM trend on tumblr/youtube etc. I see a lot of people wondering if it's the right path for them and asking people on message boards/tumblr/youtube if they're trans. We all know that no one can know that but you. I can't tell you and neither can anyone else on the internet. There are some things I've been mulling over and considering when I ask this question and I thought it might be helpful to someone else.
NOTE: This is MY experience and how I'm processing. This is not intended to be an end all be all of how to figure yourself out. Take this with a grain of salt.
First and foremost, I recognize that being trans is not a game or something to take lightly. It's not something you can turn on and off like a faucet. You can't be trans one day and not the next. (I'm talking about being trans as in transitioning. I'm NOT talking about bigender, genderqueer, androgynous, 2 spirit etc. I'm also not saying identities don't change and evolve. That's another issue and a whole other topic to consider. For the sake of this post, I'm talking about being FTM.) I recognize that there are both positive and negative consequences to transitioning. I recognize that FTM is NOT the only option. I can be any of the gender variants listed above. I can be both if I want to. But, honestly I'm not both genders. I'm not neither gender. What's helping me figure myself out is questioning if I'm willing to lose everything to be Darrin. Is it THAT important to me to be him? Being trans may seem cool until your best friend decides s/he can't handle it and leaves. Or, your partner leaves you when the changes occur or your family can't handle it. I'm not saying this will happen. I'm saying it might and am I prepared for it? Will I be ok growing old as female? Will I regret it?
Transitioning is a huge step beyond just hormones and surgery. It's an entire lifetime commitment. It's forever. My female self will be dead and I will be consumed with Darrin. He will be me and I him.
I guess I got a little sidetracked, but I guess I'd say are you willing to do anything and lose anything to be you? Is it that important? Just something to ponder.....