It is always difficult to predict emotional matters. Sometimes you have the right soul but are born in the wrong body. God's jokes are sometimes well-intentioned but always full of ups and downs. It is right to stick to your own path. Gifts for lesbians should of course be mainly female gifts. Cute gifts are more important. It is also time to show your care. I can give you some suggestions:
1. You can give a cute teddy bear. Girls will like cute gifts very much. I believe such a birthday gift is also very good. She will definitely like it.
2. Of course, it is also very good to give couple gifts. You can buy a set of couple clothes or couple shoes. Girls will look very cute when wearing such clothes together. I believe she will be very happy with you wearing them together.
3. Give a beautiful bracelet as a birthday gift. Girls will look more feminine when wearing bracelets. You can go and have a look at Swarovski's crystal bracelets. They are all very good.