Here is someplace that sells the belts:
http://www.spinnerschoice.com/Spinni...s/default.html
Stretchy poly-cord drive bands for your spinning wheel are durable and easy to install. These flexible spinning wheel drive bands offer a stronger draw in than conventional cotton belts and will last and last. Choose from traditional clear or black or bring some color into you spinning with NEW shades of crystal lavender and crystal rose! Available in single drive ($7.00)or double drive ($14.00)or pre-fused for Louet S10, S17 and S51. ($9.95) All non-fused spinning wheel drive belts include easy to follow instructions.
I'm thinking she used a single but bought double just in case.