Buuuttt the thing is, LE did believe them at first that the baby had been kidnapped. It's possible any evidence was gone by the time LE started to get hinky about the story.
And I wouldn't see why she couldn't carry 25 lbs, she carried that big honkin box of wine like it was nothing, she yanked that sucker off the shelf and away she went.
She should have been used to carrying Baby Lisa around a bit as well so that would be nothing. I'm only 105lbs and I'm sure I could carry 25lbs for a long long way and of course adrenaline would be kicking in, survival mode at some point.
Still, it's possible she didn't "carry" her anywhere. The river can be reached without going down hills, etc. InDepMo drove right to the river in a vehicle without any restrictions just a few days into the investigation.
Not within the realm of possibility too that the baby was never dead until it was disposed of. The hit on the bedroom floor could be a false of course LOL