If she can come to Asakusa There is a shop which has 200 variety of sake named Ninja sake store. Or Ninjabar Asakusa.
I recommend you to go to sake brewery at FUSHIMI in KYOTO because this town is very famous for producing sake. You will be able to learn how to make sake, and the atmosphere. Of course, you will taste some types of sake and feel the difference.
Basically, there are 2 places below that you can visit and enjoy.
1. Gekkeikan ookura
2. Kizakura fushimigura
You definitely enjoy either 1. or 2. but you should be careful about the business day of these spots.