I sent an e-mail last night to the address you listed.
The letters were written to Nora between 1912-14 and she passed away in 1915.
I haven't seen the name "Wynn," just mentions of Nora's "mother and father." The name "Jean" comes up (I believe Nora's half-sister?).
I will try to scan some of the letters this weekend and forward them to you.