, you can apply for in-country initial Non-O visa when you enter Thailand on 60-days visa-exempt entry, then apply for a 1-year extension for that same reason.
You cannot apply for a 1-year extension for any reason directly from 60-day visa-exempt entry stamp.
, you are correct. No financial proof for a foreign female to apply for 1-year extension based on being married to a Thai husband at the local immigration office inside Thailand. As I wrote in my first comment, you should go to the local immigration office for the requirements handout to check what documents you really need to prepare, including whether you need to provide your husband's finances or not. Detailed requirements vary by office.
You can go to your local immigration office to apply for a 1-year extension based on being married to a Thai national. You need to get some official documents such as a marriage certificate, etc. Go to the local office and get the latest handout for their requirements.
You can apply for an extension until the last day of your current stamp.
Dear members, please don't ask any question here unless you apply for a DTV as a remote worker through RTCG in Vancouver. Or make a comment to a post by Tod Daniels.