I visited Angeline Morrard of "Angeline's Aromatics" and noticed that she had 513 base gold. I find that odd seeing that she's supposed to have 500 gold as default maximum (http://uesp.net/wiki/Skyrim:Angeline_Morrard). Glitch?

It could be possible that you bought something from her before.

Otherwise, I'm not sure.

This happens to me sometimes, with just about any vendor. It's almost like sometimes they will generate a few pieces of gold in their inventory (when their stock resets), which just ends up in their gold count.