And it's really damning for LH. We don't yet know the exact context of her words at daycare but unless she said something like “What? What do you mean Ross never dropped Cooper off? That can't be - I spoke with him less than an hour ago about picking Cooper up. <pause> OMG! He must have left him in the car!” then she's toast. Very, very burnt toast.
Not to mention that it never occurred to her to call 911 to meet her at HD. She did the "research" so she knew how critical it is to get medical help immediately. To her knowledge RH was still at work, otherwise why would she go over there?
Even if she knew there was a strong possibility Ross left Cooper in the car, if she's truly innocent she would not know the baby was dead. iow, if Ross had threatened to do it or had done it in the past, wouldn't she assume he left the windows down or left the car parked in the shade and that Cooper was still alive? Instead of summoning 911, she took a witness with her to Ross' office. It is possible she believed Ross was still at work and the child was in his car, still alive. The witness would help her get an order of protection and full custody of the child, if that was her plan. We still do not know her side of the story.
JMO