It's your body dude, not hers. You're the one who needs to accept those risks if you decide to take T.
Personally, I've had no negative effects. I started T at 42 years old, I'm now 47 and my blood pressure is still on the low side of normal, cholesterol is fine, I feel better, fitter and younger than I did when I was 40 (and I'm 30 pounds lighter than I was at 40 as well).
Your mileage may vary, but for me it's been nothing but a benefit (oh, and I still have a full head of hair, although I do know a lot of trans guys who don't).
Dennis