Since im going through a divorce and file my taxes separately from my wife, do i need anything from her?

Yes.

If I am filing a separate return why do I have to list my spouse’s information on my return?

Even if you file separate returns (the worst way to file) you each have to list each other's SSN's and some other information on your own tax return.  The IRS can then cross check to make sure you are not "double dipping" for itemized deductions, dependents, etc.

If you are in a community property state, there is more information that will be needed.

Community property states:  AZ, CA, ID, LA, NV, NM, TX, WA, WI

If you are still married you can still file a joint return if you can agree to do so ... things get messy if you are in a community property state. 

Married Filing Joint vs. Married Filing Separately

https://ttlc.intuit.com/questions/1894449-married-filing-jointly-vs-married-filing-separately