If you're a couple of weeks out, you should be fine, but i doubt anyone will be able to tell you with any certainty since it depends on how Immigration sees your 'been here a lot'.
Obviously nobody here has a list 'been here 10 times -> ok' 'been here 11 times -> not ok'
David Broadfoot If "reports of people" beats a "report of a person" right now talking to you, with a real-time screenshot of the actual visa scheduling website, I gotta question your reasoning skills, mind me.
I do not think they have a quota. As per a link I shared above in a separate comment, the approval ratio for Thais for 2020 (as per Dept of State own statistics) is 75%.
Since mid last year I've been helping Thai people find interview dates and just generally being immersed in the whole US visa space (but NOT a visa agency, ...yet) there's a lot of stuff people do wrong.
But lots of weird going on, literally offering a job such as a restaurant job IS a red flag for overstaying a B2 'tourist' visa. Your wife would've needed to apply first through a marriage visa, go through the process of getting a green card, and only then would she be allowed to work.
Employment visas are WAY more complex and lengthy and require for the company to show they've tried to find help in country first.