D21 was sent an update with an offer of additional merit in April. It was only a few thousand more and at that point they did not offer the major she wanted.
WPI notoriously says they do not match other offers, so mentioning NEU will not help.
I do think it can be worth reaching out and asking if more merit or aid is possible. If asked by admissions at the accepted student days, she can be clear cost is a factor with a twin starting at the same time.