What Are the Requirements for a METV Application in the Hague?

Hi there! From January onwards I will be studying in Bangkok until June. My girlfriend will be traveling with me and plans to apply for a METV. I've got a couple of questions regarding the application:

1. A bank statement is required with a mininum balance of 20.000THB, does this mean that she needs to present a statement from the six previous months (so six statements) with on every statement a minimal amount of 20.000THB? Or do they accept it as long as she has the amount on her account when applying?

2. Correct me if I am wrong: she needs to leave the country every sixty days to get a renewal of another sixty days? What happens when she already leaves after 30 days and comes back?

We will be applying at the consulate in The Hague.

Thank you very much.