Any other troubleshooting steps for Yosemite WIFI issues?

I've spent several hours this weekend at my friend's house trying to fix the WIFI issues on her Macbook. I had installed some software on it recently (Chrome, Plex, Teamviewer) and I removed all of it just in case there was a conflict (Plex being the only thing I could think might be causing an issue with the Plex server running.) I then realized she had upgraded to Yosemite and found out there seems to be a lot of WIFI issues going on. I've come across several blogs with troubleshooting steps and here is what I've tried so far:
-Reset the modem to factory settings
-Toggled the checkbox to authenticate changes in networks
-Renewed DHCP lease
-Disabled Bluetooh
-Removed network configuration and preference files (and later restored the backups I had of them)
-Created a new WIFI location with a custom DNS
-Unloaded/reloaded discoveryd files
I wasn't able to get any kind of WIFI connection between removing the network configuration and preference files and unloading / reloading the discoveryd files but then I plugged into the ethernet after reading there were some conflicts with Apple applications so I re-installed Chrome and the WIFI started working again for a little bit. I am typing this from my Macbook still running Mavericks on the same WIFI connection so I'm fairly sure this incident in 99% Yosemite and nothing else on the computer. I'm willing to try any other intermediate troubleshooting. She needs her computer a lot this week (works from home and has a big event this weekend) so I am going to hold off on the fresh OSX Yosemite install or an attempt to downgrade to Mavericks again - fingers crossed the update is out before that becomes a necessity.
Thanks for reading!

Hello MCHLWRRN,
Thank you for using Apple Support Communities. 
You can start with this article for Wi-Fi troubleshooting.
Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
Regards,
Jeff D. 

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