Read @Liquorice post where he states the following.....
"You are aware you can stay in Thailand for up to 2 years with the 0-A visa, before the need to visit an Immigration office to extend her permission of stay"...
Yes currently she has a 12 month permission of stay.
Non O-A is a multi entry visa.
Every time she exits and reenters Thailand she will be stamped in for 12 months for the validity of the visa.
If she exits and reenters just prior to expiry she will receive another 12 months.
Her need for extension will be in a couple of years if she wants.