So you've never had a mc? 
Yabu and I think you know you are.
Be supportive or don't pretend you're her friend.
I've lost 3 babies via 2 mc both in 1st trimester and 1st quite early on, barely knew I was pregnant like your friend.
Doesn't make it ANY less upsetting or worrying!
It is NOT just "disappointing" it's heartbreaking, it's a loss of future hopes and plans, it makes you worry about your reproductive health, it impacts your relationship, it impacts your future pregnancies as you're scared to believe it will go well....
You are seriously lacking in empathy and compassion
I am hoping you are quite young yourself though that's really no excuse.
Do better, learn more about how women who mc feel
The babies I lost would be in their 20's now and I still think of them all the time and especially on the anniversaries of loss and due dates - this is fairly common.
My aunt and gran also suffered losses which I didn't learn about until I had my 2nd as I'd not told anyone about the first until then. They too remembered and grieved those babies and they were far older and longer past the losses than your friend currently is.
Has she even reached the rough due date stage yet? Because until she does she will likely be thinking about how pregnant she would be, what she'd be doing if she were still pregnant (buying clothes, arguing over baby names with dh...) and then after that she will be thinking how old they'd be, what milestones they might have been reaching etc
You actually don't sound as if you even like her very much, you certainly don't respect her
Her experience regarding the earlier one is very similar to mine - what that can mean and was the case for me was that not only did she not "deal" with that pregnancy medically, she didn't do so emotionally either.
During/after my 2nd mc all the feelings I'd suppressed from then came flooding out. I was a mess!
Luckily I had a v supportive dh and friends with me.