本句可以调整一下语序。
Since she has no interest in anything other than music and instruments，what that would be is a frequent dinnertime debate.
鉴于她只对音乐和乐器有兴趣，那会是一场常发生的晚餐时间辩论。
原句中，since是连词，意思是:由于。
since这句话，按照英语说话习惯放在了主语从句中间。
类似地，I ，however，like it. 然而我喜欢它。
What that would be is a frequent dinner time debate.是主语从句。
主语what that could be，系动词is，表语a frequent dinner time debate.
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