OK, before this thread disappears over the horizon, what's the answer?
It could be you didn't want to spoil it for the old girl as she could well have set her sights on the new system and you didn't want to upset her.
It could also be that "preaching" to her could have ended up in your being reported to your superiors and receiving a reprimand, exposing you to potentially damaging recriminations (nod, nod, wink, wink!)
C'mon Spanner, what's the answer?!