So, not too sure if this depends on the version (or maybe a glitch?) but seems like you don't need to worry about feeding her the first 3 days. Focus on getting the gag, boards, chains, nails and hammer. For me, I did the hammer, nails and chain pickup the 2nd day, threw them on then used my last 2 moves to grab the gag and boards.
Uh, update:
3rd day, I fed her and then chained her down, followed by the 4th day where i fed her again, grabbed the board and then used it. The gag was grabbed and used on the 5th after feeding her.