It sounds like you need to put on the brakes for the idea of breeding and really take advantage of all of the information available on this site for now. Start with correcting your basic husbandry issues like using a seperate feeding tub still and then get into the breeding info . A 1000g. Female is still way too small and there isn't any need to "introduce" the snakes beforehand. Going off food is totally normal so you can't just make up your own timeline of so many weeks of eating should get your female to gain X grams by a certain time (though we all dream it from time to time lol).