You edge towards her cautiously.
"I understand you must be very confused, so please allow me to explain. I'm..." She stops as you poke her a few times. Your finger doesn't pass through so you can probably assume she exists. Just to be safe you give her a quick lick, noting for future reference that she tastes just like raisins.
She stares at you for a moment before slowly raising a hoof to her forehead. “Celestia, why must the universe hate me?” She lowers her hoof and forces a smile. “Okay, I’m going to go into denial about the fact that I’ve just summoned a complete idiot to help me. Let’s start over. I’m glad you’re here. I need your help.”