Actually, if you have a copy of OEM XP, you can use your disk along with her serial code. It's the code that's important... the source of Windows isn't.
You can uncheck everything in MSCONFIG's startup tab except for the things that are absolutely needed (AV, firewall). Click Apply and reboot.
And get rid of the QuickLaunch crap. They slow down a system as well. Set her up ObjectDock or RocketDock instead.
My Rig: SABLE
Antec 300 Illusion / Antec EarthWatts EA650 650W / EVGA GTX 760 2GB
AMD FX 8320 x8 Black Edition / Gelid Tranquillo / MSI 970A-G43
Sandisk Ultra Plus 128GB / Samsung 840 120GB / WD Black 750GB / WD Green 1TB / WD Red 3TB
G.SKILL Ripjaws 2x2GB DDR3 1600 - Crucial Ballistix Tracer 2x2GB DDR3 1600
Win7 Ult 64-bit - Func MS3 Mouse - CM Storm QuickFire Rapid Mech Keyboard
R.I.P. Danny L. Trotter
... 14 Nov 1945 - 4 Sept 2009