If your landlord could file it online, you can ask your landlord to do so when you are about to renew your yearly extension, or when registering your 90 day. Those are a few occasions immigration actually requests to see your newest tm.30
Have you marriage license authenticated by the Thai embassy, consulate there if possible. US embassy in Thailand does not legalize any American documents for you here.
Front view of house where house address number must clearly appears next to you and spouse. Bedroom, living room, dinning room with you and spouse. Chang wattana officers literally circle the address number on your photo, tm.30 slip and on your rental lease. They must be the same address number of course. Other than that, bedroom, living room, dinning room with you and spouse. Copy centers there can print them in color, sending to them via Line App.
strong ties to her home country such as solid financial status, jobs, land properties and all that. Imagine the US officers assume all Thais would most likely to violate the US tourist visa status by not coming back, so its her job to prove otherwise.