Now you are selling her short. Because she has had nothing (that you know of) in the past to deal with, you imagine she will not be able to cope with possible future difficulties?
The very stability of her youth may have given her just the qualities for which you are looking. Because of her relatively smooth past, she may be grounded and stable enough to be able to deal with the problems that come up in any marriage. Sometimes people who have had a great deal to cope with in their youth handle it fine but when they are settled find that the daily ongoing difficulties of marriage and (G-d willing) children are the straw that breaks the back. There’s just too much baggage in their closet for anything new.
If you like her and she likes you, and she is aware of your family situation but still willing to go on, have faith that Hashem thinks you deserve each other. Don’t go second guessing G-d, unless you can come up with a better argument than this.
Hatzlacha rabbah and may we hear besuros tovos bekarov.