Well that adds some clarity. From your first post, she came off being somewhat manipulative, but not so much now. My wife will still occasionally says that we should have another - and we are 51, and our youngest (of 4) is 17
! I think that sometimes they just miss the stages that the kids have passed when they realize that they will never have that again (cuddling a new born for instance).
I think that you two should have some discussions about what it is you both really want and why. Definitely don't rush into having another child until you do. It is a serious commitment to have another child. One that will have an impact on your lives forever. A couple questions for us drunkards on the forum - how old are you and your wife, do you have a boy and a girl now?
My wife and I had two girls first, so it was me bugging her for a third so that I could have a son. Well of course you know that we had a third a girl. So the begging began for a fourth child. Finally she relented. Once she was pregnant and past the second trimester, I got the old snip-snip. We decided that 4 would be enough no matter the sex of the last one. (We always chose not to find out the sex of the baby.) We were convinced that the last one was a girl, and were genuinely surprised when it was a boy. I can say that each child is a blessing, and I can't even imagine having less than we do. But it is a major commitment.
Other things to consider - Having 5 (or more) people in the family makes it harder to go to restaurants (need a bigger table). Vacations are more expensive - need a bigger rental, or two hotel rooms. More airfare, depending on where you are vacationing. Perhaps a larger vehicle. Maybe a bigger house.
It's a lot to consider and if you both aren't on board, it would probably be best to hold off. Marriage and family are hard enough without the added stress of a child that you may not really want. It certainly would not be fair to child to be born into that situation.
Best of luck
and keep us posted!
Edit to add - no matter what she says and how good her intentions are, you will not have more time for brewing.