second photo shows splitter - the cables coming from it will have been/should have been connected to hub and tv boxes - so connect those to new hub and any tv boxes - phone activation line and it should work
if she is only going to fit a hub and no tv box/s then unscrew the input cable to the splitter - the one coming from the wall box and just connect the single cable from the wall box to the hub again phone the activation line
removing the splitter will change the input levels and could take them out of range - if she can post them after its setup someone will comment
log into hub3 - 192.168.0.1 [or 192.168.100.1 if in modem mode] - DON'T SIGN IN, click - click router status [centre of screen] - and post the downstream and upstream figures - to see those press on the grey buttons/boxes labeled - upstream - downstream
She only has Internet, no TV, she has moved in today, and has currently got furniture and boxes in front of the wall socket lol, when she uncovers it, she will have a look with all the helpful suggestions above, and get the photo as requested above.
I'm really pleased I joined here, really helpful guys, thank you.
One more thing: open the termination box and see if an isolator has been fitted, if it isn't connect the isolator cable (black band end) to the box first then the coaxial cable to the isolator cable. It's all a push fit.