I proposed option 1 because I am also aware of internal H1 band data. By practical, all existing employee at band H1 who has no experiences will always got offer with 12,000THB / mo. that is the appropriate align with current structure. If not the new hired and the existing employee with some year of services in TOTL will got the same package and may cause future problem.
As discussed, if you preferred to bring her up to median of external data then pls kindly confirm and talk to Khun Mike for getting his agreement and approval then I can process the next hiring process.