The OP and most of the comments are talking about how it's much closer to earth than a normal satellite.
Only half as far, right? That'd still at most halve the distance it has to travel in the roundtrip. Mum having half latency would be nice, but it's still going to be fairly painful; we're not talking in the 100ms bracket here.
(Fair's fair, it's quite possible that Mum doesn't have good satellite internet, I don't know the full details!)