Perhaps she felt really sad when a baby died and sharing in the parents' grief, maybe with a "care" emoji, helped?
If she hadn't looked at them, it would probably have been wheeled out by the prosecution as evidence of how callous/heartless/brutal she was.
The media (or maybe the prosecution as well, I forget) tried to use the fact that the babies who died were among the sickest on the ward as evidence that she "deliberately targeted the most vulnerable, to be sure of causing death", when of course the sickest babies were also the most likely to die in the first place if nobody have been murdering them.
So none of this proves anything, either way.
The problem is that normally the issue is "Someone murdered this person, we think it was X". But in this case, the question is whether anyone was murdered at all, and the courts are really not set up to determine that - it should be a matter for forensics and the coroner, and there is hardly any evidence for most of the babies because none of the doctors thought any of the deaths were suspicious until the whispers got going about Letby (as a PP mentioned, it really is like an episode of The Traitors). If the babies were murdered then LL is very like the only possible suspect. But if LL didn't kill them, then it was a combination of bad hygiene, other medical errors (read about Dr Brearey and Baby O - your hair may stand on end), and them being very sick to start with. It's not at all clear to many people that the evidence for this reaches the "beyond a reasonable doubt" level.