If she doesn’t want it it's her choice.
The level of resentment caused by "not wanting to blackmail her"will be off the scale if she realizes her career/future/social life is adversely affected by the decision she (you) make in the next few weeks.
Give her space to think and decide what course of action to take.
Sorry about the dark tone, it's just not everyone thinks babies are great/amazing/life changing in a good way.