Hi! First post! I'm a local and walk in the st. streets area just about every day. I've participated in one search day and plan to go tomorrow now that I'm off work.
It looks to me like the truck picture does show her getting run over. The darkest shadow by the wheel should be directly underneath it where it's making contact with the ground. That's not the case. The shadow under the front passenger wheel actually has a ring of light around it before the shadow gets dark indicating it's not making direct contact with the ground. If she had her tire turned, do you think she would fall sideways instead of being projected forward? I do. If so, and she got knocked over, then it seems feasible that she could have hit the ground first (possibly her backpack first, making even less noise), then her bike on top of her. If the bike was on top of her, then it seems it would have a better chance of getting caught in the undercarriage. If her backpack was on her, it also could have provided something of a cushion for her. If the funeral home does have video, then it may not even show anything amiss because she'd be part of the dark shadow under the truck. I think that would depend on the angle of the camera. I don't know anything about getting run over by a bike so I'm wondering - is it possible that she could have been dragged a little ways and survived? It seems possible in my mind, but I'm not sure if that's just because I want her to be alive so badly.
I do gobs of photo editing. In photoshop, I used the dodge tool set to 100% on the midtones of the shadow under the truck. Dodging the shadows made a big difference and it is apparent (even showing a portion of a circle that looks like a bike wheel) that something is under the truck. I don't know how to upload an image on here or I'd share!