I went back to work for 5 weeks before my redundancy kicked in and felt guilty about taking him out of the nursery as he loved it! I am having a few months out as a sahm but def want to do something for me too. But I won't feel guilty either way - as long as you have good childcare so your child is happy when away from you then why should you - it takes a village to raise a child and the childcare, if chosen carefully, can really enrich your child's life as much as being at home with them.
If you're a nurse or a doctor then you have worked very hard for your career so if you want to continue to develop that alongside being a mummy then why shouldn't you.
If my mum had commented like that I would have pulled her up on it as:
a. I really don't need my own mother to purposefully criticise me and make me feel bad when already having a hard time going back to work
b. Why did she bring me up to be a strong woman with a career
c. Times have changed sine the late 70's if she hasn't noticed - being a sahm is actually a luxury these days!