As a new OW Sapphire (AA Plat, thanks to FT), I found this forum very enlightening--learned I have access to all OW Lounges on international flights. Great!

However, I am flying with my 92 year old mother (no airline status) on BA, YVR - LHR WT. She is normally self-propelled, but she allows me to request wheelchair assistance in airports. The extended standing and walking is too fatiguing for her, especially when security lines are long.

Will I be permitted to take her into the lounge as a guest? I am guessing that only BA lounges will be available to us, as I assume we will be accompanied by a BA CSR. Is that correct? Should I phone a CSR in advance? Thanks in advance for any advice.