Many thanks to those of you who answered my previous question, this is a short follow-up one.

I will be flying out of TXL on LH and it turns out now an old friend of mine will drive me to Tegel airport which is of course very nice of her.
I was thinking, just as gratitude to her, do you think LH would allow me (*G flying LH same day) to take her into the SEN lounge as a guest?
She's obviously not flying that day (and has no *A/LH status or such as far as I know).
The lounge is located both before security and BP checks so technically it's not a problem, and I am allowed to bring one guest, but does the guest actually have to fly as well?