How happy can this letter-writer be? She bemoans the loss of many of her past friends, as if she has very few or none left. That's the way it is in the JW world though, your friends eventually move on one way or another.
Then she says "she has heard this news" about your daughter. Then she accuses your daughter of "lying to her all this time". That can't be true, for she hadn't heard from your daughter in quite some time. Losing touch is not the same as actively "lying". But that's the judgmental JW mentality.
Then she questions whether or not she should go on being your daughter's friend. That right there says that the friendship is conditional, and not really real.
This letter-writer needs to concentrate on being encouraging within her own congregation, helping the elderly, etc. -- because it sounds like that's what she's going to spend the rest of her life doing while waiting for Armageddon. She certainly is not headed for a family life of any kind, from the sounds of it.
As for your daughter's boyfriend, if he passes the "smell test" in your opinion, then your daughter probably has a good thing going.