Sounds like she is wanting to make even more money getting you to buy thread. I use Coats and Clark and Connecting Thread's Essentials. I clean out the bobbin area with each bobbin change. Tell her if your thread won't work on that machine you will need to return it and buy a different machine. I bet that will change her tune. I have noticed now days that some are getting so money hungry they will tell you some real stupid things to see if we will believe them. I bought a Deely Bob that has several different spool holders and one of them should work, if you really need them.