I live in village Mykhailo-Laryne. I am descendant of those people, that were forcefully resettled from Olchowiec. But many people who live in Michailo-Laryne are originally from Khrevt. I know people with the last name KSIONZHIK and SHCHAPOVA. If you are interested in information about the fate of your mother's family, write to my e-mail firstname.lastname@example.org
I will glad to help you in your search!