You should be able to get her passport back before then.
If you plan to cross a land border crossing to enter Cambodia she could telephone the border immigration at that crossing to check if it's possible to cross with a border pass instead of a passport. You can usually find the border checkpoint phone numbers from Google maps.
In the past cross border bus & train tickets have been acceptable as long as the ticket states the final destination is outside Thailand, & it shows the appropriate travel date.
I've said immigration officers can also. You should read the entire thread before saying something.
The issue is about rules. There are rules. Sure, we know they break them on a whim but that doesn't make it ok to try to interpret their breaking of rules as if you are a mind reader.
"Abusing the system" is a nebulous thing you imply which any person can interpret in multiple ways. It's exactly that kind of vague comment that turns these threads into trainwrecks. Is the "system" so frail & we so strong we can "abuse" it so easily? Should we feel pity for the "system"? Is it a good & just system?
A year or two is very, very easy. That's only 4 tourist visas & 4 visa exempt entries. After that the problem is finding a consulate that will issue a tourist visa when you have had 2 years and said previous visas. There are options, but it starts to get hard at that point.
Calculating the annual visiting tourist numbers with the number said to be in the country at any one time we can see it's a tiny percentage of overall tourists who stay on for a very long time (more than a couple of years).
What information have I said that is "way off the mark"?
You talk about yourself in that regard. You talk rubbish, then when proven wrong you start waffling these silly comments trying to reverse reality but give zero examples. Where are your facts, evidence..? You have offered nothing.
There's a small group of bitter trolls that have nothing better to do than try to dissuade posters here with this mumbo jumbo about tourist visas not being 'proper' visas or illegal for longer stays etc & despite being constantly proven as spreaders of malicious misinformation you guys come back & do the same with the next poster. I don't know why this tiny brigade of curmudgeons are tolerated.