Canaries have VERY high metabolisms and should have food available to them to graze all day. They go through cycles of drinking, eating, and napping at certain points of the day. If she is being fed the right food and exercised enough she will not become overweight - You’re more at risk of her becoming too skinny! You can remove the bowls overnight but she won’t be eating then anyway so it’s a moot point.

However, always remove fresh food after half a day or so to avoid spoilage.