I also don't see the problem with calling it elimination communication... you aren't expecting the kids to say it... You are just teaching yourself to read your child's cues, and your child to have more difinitive cues (hence the 'communication') about when they need to go. (Hence the 'elimination') I guess she could call it poopy-signs, if she doesn't want to overthink it. ;)
I imagine you could start the same way I did with my younger baby. (since she was about 8 months...) Instead of changing her on the bed, I started taking off her diaper when she needed it, and giving her a couple minutes to sit on her potty. Tell her to go potty, and give her a sign. (I just use the sign for poop~ make a 'thumbs up' with your right hand, with your left grab your thumb and pull up. (the left hand slides off your thumb, right hand stays stationary...) If she goes on the potty, AWESOME! Tons of praise, maybe a treat. If not, just clean her up and put her in a new diaper. (Or a pair of underwear with a pantiliner, if you are willing to keep a super-close eye on her... it's easier to tell when they are going...) Also give her a chance to 'go' within 10 minutes of feeding, or waking up. Eventually you will be able to figure out her bladder's 'schedule', and natural cues that she needs to go. Hopefully, she will pick up on the signs you are showing her and more difinitively let you know. Good luck!!!