Could this be considered a wrongful death

I'd say it's a long shot. You'd have to have a doctor, preferably one of her treating doctors, who was willing to testify that the stress caused the death, and that doctor would need to have pretty good expert credentials, such as being on a medical school faculty.  My experience with experts of this sort makes me think that the essential part of the case would be very difficult to put together.

If you had enough to get into discovery on this case, your daughter's life would be opened up and tossed around.  You should talk to a lawyer in your area, for reliable advice about whether you have a case worth bringing and, if so, what it would require going through.