Can my friend extend her Visa on Arrival extension in Bangkok instead of Chiang Mai?

A user is inquiring whether their friend, who entered Thailand via Chiang Mai International Airport with a Visa on Arrival (VOA) valid for 15 days, can request a 7-day extension at an immigration office in Bangkok. The comments clarify that extensions can be processed anywhere at immigration offices across Thailand. However, there seems to be a misconception regarding the type of extension, as one comment indicates that a 7-day extension is not possible for the VOA, implying she should prepare to leave after her initial stay.