Free-standing `\label's [supposedly] work as expected in LaTeX; in Info files, a `\label' is taken as just another name for the node the `\label' is in. Determining which node it's in doesn't take account of `\input's -- it's the one it "appears" to be in -- which may not be what you want. You really should use node-names as labels (see section See Node_specifications)...

Labels (and, therefore, nodenames) shouldn't have weird characters in them. Such labels (nodenames) will be studiously ignored.