I'm butting in on this one!

I was coming around to it actually being about coupons, until I saw the screen shot of the phone records. TM texted the 'got he ad' to the same person she texted asking for OJ and potstickers. Which she says was Sidney. So presumably it was actually Sidney that she texted 'got he ad' to.
So what I would want to know is... why not only lie and say she sent that to AC, but also why get AC to lie about it?
Or did she text AC for the potstickers, and is saying she texted it to Sidney to cover that he wasn't home?
Either way - the stated recipient of one of those texts is a LIE. Why?