I haven't talked to her in months.
Are you going to talk to her again?
It may be possible, I'm just not sure.
If you've been ignoring someone that has been close to you for months, it isn't appropriate behavior as it is emotionally hurtful to be ignored. I would instead try to resolve the issue that has been causing whatever rift to form between you two.
I'm gonna explode if I don't speak to her soon.
That is a sign that you still care about them,   I would take the time out to resolve this as soon as you can.