it is advisable to rotate where you apply. At some consulates they can issue a red stamp on the 2nd or 3rd application. Laos, myanmar, cambodia are all options
They may be going to a border called phu naam ron, which is closer to Kan, and bangkok. I read a 2006 post that said its a day pass system at 3 pagoda pass in Sangkhlaburi.
Entry bans start after 90 days overstay, providing she isn’t arrested or randomly asked to show her passport. She should leave and pay the fine at the airport.