“Hen” is used as a term of address for a woman in Glasgow: as in, “How ya doin hen?” – translation “How are you?”. Hen is a very common term of address for a woman north of the border, much like “love” in London – “love” though can be used to address anyone.
Here is a typical exchange one might hear in a cafe in Glasgow. Waitress to a female customer: “What’ll you have hen?”. Customer: “A cup of tea and a bacon buttie”. Compare the same exchange in London. Waitress to any customer: “What’ll it be love?”. Customer: “A cuppa and a bacon sarny” (note: butty = sarny = sandwich).