Crawling is a glaze defect in which the glaze separates, leaving portions of bare clay exposed.

potters can cover a ceramic with a thin layer of silicon dioxide and heat it again. This process forms a glassy waterproof coating called a glaze.

It depends. Does she look rough under the glaze? If so she is ceramic

No, since glaze is a process that requires it to be fired. There are professionals who use an epoxy on glazed ceramic to change colors if that is what you want to achieve.

varnish, pva glue, some glaze