Hi bjapreets,
Your decision to marry a divorced girl is a great decision. But at the same time it has lot of risks. So, your approach to know the divorce details is very important.
But, do not try yourselves to find this out.
If the girl or her parents come to know of this, they will loose trust on you even before marriage.
Tell your parents to get the divorce order copy from her parents.
If her parents are genuine and transparent about the divorce, they should give you the copy of the divorce.
Then you can verify the copy by going to the corresponding court and giving a request.
Most likely you will have to give bribe the officer there to get the order copy.
Get the help of lawyer who can help you with this.
If her parents are not willing to share divorce order to you, ask them to share with a person common to both of your families.
If they are not willing for the same also, then ask for a reason why they do not want to share the divorce order.
If you are satisfied with the reason, go ahead. Else, you try to talk to the girl openly and ask the details.
But, in any case, it is better to know the details before going for committing to marriage.
At least, one of your trusted person should recommend to go with this marriage after they know the details.
Hope these suggestions are useful to you.
A marriage can be delayed. But a marriage should not fail after it is done. It is a lifetime pain for both the families and everyone involved.