Like in Croatian, it's usually called domovína in Slovene as well, being derived from dom "home", so meaning "homeland". Since the word is feminine, it is then referred to as "she" or as "mother", so it's not too far off from "motherland".
There's also an older word, očetnjáva, meaning "fatherland" (derived from oče "father"). There is, however, no word that'd be derived from mati "mother".