Susan is having trouble streaming with her Blu-ray player and her TV. Leo says it could be that the Blu-ray's Wi-Fi isn't working too well. She may need to move her hotspot closer to the TV itself. It may also be that there's congestion on the 2.4 Ghz band, and her TV won't pick up the 5.0 Ghz band. She should try using her mobile phone as a hotspot and see if it picks it up. If it does, then the Wi-Fi spot is either too far away or is congested and swamped by other signals.
She can either move her hotspot, or end up getting a mesh router that can work better at it. She could also hard wire her network by using powerline networking. TPLink is a good one. It's like having a wired connection, but not as fast. She should also make sure her modem doesn't have a router built-in that's jamming it.