I had the pleasure of visiting WUSTL a number of years ago and had a very positive experience. I was impressed by the facilities, the location, the faculty who I met (just a couple of professors – one in particular but I will not name him), and the students who I interacted with.
I saw a lot of Pros.
I only was aware of two Cons. One is that it is hard to get admitted. Of course if you to get admitted this problem goes away all at once the day that you get your acceptance email.
The other Con is that if you are full pay then it is, like most private universities in the US, expensive. It sounds like you have a tuition benefit that at least helps quite a bit with this.
I think that you should find out, possibly from your mother’s HR representative, what the benefit will cover in your case. You should also figure out from your parents what you can afford.
Separately you should think about what you want in a university, and whether WUSTL would be a good fit for you. Part of this, but only part, will depend on what you are likely to want to study.
I am confident that employers throughout the US and graduate admissions at pretty much any university anywhere know how good WUSTL is.
When students have attended university close to home, sometimes they live on campus, sometimes they live at home, and sometimes they live on campus for one year for the experience and then live at home for three years to save money. In terms of attending university very close to home, if you live on campus it is still like being in a different world compared to living at home. If you live at home then you can save quite a bit and be in a familiar situation, and can still participate in campus activities.