[Seihai]

The fact that Sayaka perceived is that Homura saved her, nothing more. That procedure maybe took 1 or 2 seconds. Imagine yourself in Sayaka's shoes, you're about to get crushed by Kyoko. Suddenly, a person appears before you and throws you out of the way, and just shortly after you hear Kyoko's devastating spear hit the ground. Nothing strange, right? Additionally, Sayaka was facing the other direction so she didn't really realize what was actually going on, and her eyes were closed as well.

For easiness though, maybe Homura kicked her out of the way and that kind of physical contact doesn't count. Remember how she also "touched" Charlotte to place the time bombs, whereas the physical contact was only that she touched the mob with her feet.

Or even easier: she can choose whether time is frozen for things she touches.

edit: Here's my take on the infamous illogical episode 5 rescue scene:

Homura was able to avoid Kyoko's barrier, whether it be to use a trick to overcome the wall or to come from above (the same way Kyoko escaped the scene). Now for the actual scene. We see that Homura walks a few steps, and afterwards we only see her appearing from above. Why is that? After she took the steps, she walked over to Sayaka and immediately threw her to the side. Then to avoid Kyoko Homura jumped back to the middle. The fact that she touched ground with her right foot first supports the logic. You jump with your left leg, your body usually rotates to the left and animation wise it fits the way she faces. Bingo?