The expiry date on the K1 visa is immaterial now. The visa is a one use only document and is used in entry. Having filed for AOS.. and responding as required with and RFE, she remains in a period of authorized stay until the process has been completed
Your only task beyond that is to enjoy life together.. oh and begin gathering documents for the next stage .. Removal of Conditions.. that will be done 2 years after getting through AOS. These documents give evidence of your shared life over the next few years