I am sorry for her, but she can only hope that the worst features don't get past the planning stage, and I am sure she is not the only one pointing out unacceptable things about it.
There are planning restrictions on noise, height relative to nearby buildings, flood danger, and a lot of other things, so if she concentrates on those she will have more leverage on the planning department. Comments about her own enjoyment of the lovely place she is in now won't hold much weight with them - in fact they are likely to make them regard her as a "nimby objector".
Near me an applcation is in for a four-storey care home on a site in the middle of one and two-storey homes. The proposed edifice is far too big for the plot it would be on, not just in height but in its footprint on the site - no space left round it for the sensory garden, participatory garden etc etc that are described, or for the residents to sit out in the sun - there is not nearly enough parking provided for staff and visitors, and the sewage system is already almost at capacity, so where the effluent will go for another 50 loos and the washing of fifty sets of bedding a day heaven alone knows.
These are the things that the neighbours are mentioning in the objections, because these are the things that the planning committee wil judge it on. It will be re-submitted, of course, with bits altered here and there, until it gets past. The hope is that it will be trimmed down to a better size.
Incidentally, I am not sure how her letter reached the papers, because objections to planning consent here are not made public. She must have copied it to the press.