The original poster, in fact, I think that since your female boss is very caring towards you and other colleagues, you can directly give her a birthday cake as a gift, because it is mainly for blessings, and also for gratitude. Although sending a cake is nothing new, it can already reflect the above two points.
In fact, you can also ask other colleagues for some suggestions, such as everyone working together to give her a better birthday gift, jewelry or something, because it is given by everyone, how could it cause misunderstandings! Even if there is a misunderstanding, who is it misunderstanding, it is all given by everyone, don’t you think so!
Finally, you can choose some other creative birthday gifts, such as a colorful sun jar. If you put it in the sun during the day, it will automatically collect sunlight, and it will automatically emit a soft light at night. Such a gift is more personalized and can be used as a night light at night. It is very good. You said that your female boss is single, so it can be used at night, because many women are afraid of the dark, and it will not cause misunderstandings.