Hey dude,
I, myself, am 30 and married. My wife also turns 30 this year. I also have a PhD in Psychology which is never a good thing when it comes to marriage! Anyhoo, take what I say with a huge grain of salt as I am a researcher and not a counselor.
Cumulative stress is a killer. It drains the body of resources and can dramatically impair your partner's mood, ability to process information, reaction time, sleep, and even immune functioning. If she is not wanting to talk to you, then definitely don't force her as this will add pressure or stress onto an already stressful time.
So...what can you do. Flat out tell her I'm here if you want to talk. Do "the little things" that show her you care and age doesn't matter. Hell...tell her she is as awesome as Iowa State! That one always works for me

Anyhoo, patience is your friend right now. Guys, like you and me, want to fix things and women (well who the heck knows). Anyhoo, be patient, acknowledge to her that you know something is up and you will be there when she is ready. To affirm the unconditional love component is always the best option!