、。
Mother is easygoing, cheerful, and a soft touch.
Literal
Mother [topic-は], easygoing [and-で] cheerful [and-で] good-natured is (polite).
Three な-adjective predicates chained with で (the te-form of the copula): [adj]で + [adj]で + [adj]です. This is the standard way to list attributes of the same subject without repeating the copula on each. お人好し literally 'honorable person-good' describes someone so good-natured they get taken advantage of — often affectionate but with a hint of 'sucker.' のんき = carefree, unhurried. ほがらか = bright/cheerful/sunny.