I worked at this company for 13 years. Networking is very important to get ahead. It seems like you don't have time for this, but make sure you attend conferences, training, etc. in your domain. You are in charge of your career, and your training. If your career not going anywhere, then you need to take action. Maternity leave was great for me, but it seems like the HR managers and some line managers are not familiar with the policies. It is best for you to become an expert in the latest maternity leave policy, and request what is due to you even if the managers don't seem to know what is happening.