A separation agreement settles all the issues ( property division , alimony , child custody & CS ) that need to be decided in the event of divorce . It is much less expensive than going to court and having a judge decide . They should be as detailed as possible to prevent future misunderstandings and also be based on your state's laws . You can have a lawyer check over her offer and make counteroffers or request mediation to clear up any disagreements .
Some things to consider :
1. No alimony/spousal support/maintenance as it's a short term marriage .
2. A detailed parenting plan , DO NOT accept liberal visitation as agreed by the parties .
3. CS as per state guidelines .
4. 50% of all marrital assets/ debts .