hello,she look pregnant from your picture,the best way to know is in the morning before feeding,if she is big with that black area behind her belly that means she is pregnant,if she is try to separete herself from the others hat means she is ready to drop,so the best way is to put her in a diffrent tank,a smaller one,25-26C,a small filter and some plants,you can put some plastic ones for the fry to hide,feed her live food if you can ,if not somethig with high proteine content and wait for the fry ,after she drops remove her..all the best