I think the other posters all have valid comments. I would never leave for the airport without first checking the flight information -- is it on time? Early? Late? Luckily, I have the luxury of living outside the flight path, but still within 15 minutes of the airport, so perhaps the OP lived too far for any last-minute changes in the flight info to be of assistance to her.

My main support of the OP comes from the fact that she kept getting misinformation from various airline employees.

I do agree that there is way too much extraneous information that isn't pertinent to the complaint (and the "LOL" was unprofessional and snarky--I wish that word would disappear from online vernacular), but it otherwise is a well-written letter and I can understand her annoyance at having gotten the runaround. The comment about her husband flying UA for the first time probably won't help her position--United can hardly "take care" of its frequent flyers; it sure isn't likely to do much for a newbie of questionable flying habits.