I'm sure she does feel hard done by having been cut out of her mother's will (especially for a decision she made at 17), but in my mind it undermines the law to overrule the last wishes of someone who was in a fit state to make a decision about the disposal of their estate.
Although the daughter may have liked to, she did not care for her mother before her death, doesn't appear to have helped at all in her later years (again, I'm not condemning her for this - it sounds as if her mother wouldn't let her near) and so I don't feel that she has a claim on her mother's money just by virtue of being her biological daughter.
A will is a legal document, but now I'm not sure I'd feel secure in my wishes being upheld if this becomes a trend. Sounds like a one-off though (hopefully)
People eating and drinking on the go