Such a good example of why it's a bad idea to tell vendors that their service isn't for a wedding when it is.
Even if she'd told the photographer that this was a family reunion, it would still be bad. There's often a reason wedding services cost more, and this photographer gives the reason. Weddings are high pressure events with lots of moments that only happen once and can't be repeated. Photographers bring extra gear, and often an assistant to make sure they capture all those moments. Family reunions are a completely different event.
Vendors (as a general rule) just don't add on a 'wedding' price. And if they do, it's because weddings have extra requirements. I make wedding cakes - they don't cost more than birthday cakes of the same size and complexity. It's just that wedding cakes are often bigger and more complex. Their size often means they need to be delivered so they arrive in one piece. The fact that it's a wedding means that the cake will be on display for a lot longer than a birthday cake would, so it might need extra care, or extra construction, or whatever.
Vendors are just not out to cheat couples getting married, as a rule.