Student or Learner
Is Alexandra taking some photos?
No, she isn't taking any photos.
Here we have a question and the answer is negative. Why do we use some?
Some-Any issue is a tricky one. IMHO in your sentence using some has 2 possible implications:
a) that the asker is nearly sure she is doing that
b) that the asker thinks she may be busy with sth else. Some can be omitted in this case.
Some can also be used in questions that are in fact requests:
Could you lend me some money? = Please lend me some money (I'm sure you can).
Could you lend me any money? = I'm not sure you can.