Is the 有 in 你有想要买什么吗 some kind of auxiliary verb? I was going to the convenience store and asked my local friend how to ask in Chinese "Do you want anything?"

Her answer was: 你有想要买什么吗

I wasn't sure what to make of the 有 before the verb 想要 meaning "to want" and as a native speaker she could not explain it though she did understand my questions about its grammatical function.

Is it a kind of auxiliary verb in this sentence? Or is it a case of the special Taiwanese 有 that can be used for some references to the past but which also has other uses? Or is it something entirely different?
你有想要买什么吗. It sounds more like Taiwanese usage of 有 to my ear. I found they often put 有 between subject and verb. E.g. 我有去过；我有看过；where I often just say 我去过；我看过. In this case, I'll probably say  你想要买什么? or 你想要买什么(东西)吗?.