This was in person, but I told one of my Ts (psychoanalyst) upfront, after a couple sessions, that I did not like his minimally responsive style and I wanted him to contribute more to earn my money. I made it very clear that I would not continue to see him with that style and he did change it. It is definitely trickier in email but maybe you could always highlight the questions you want to be responded, like bold or underlie, and emphasize at the end of the email that you want answers to those points. And if she still does not address them, you can refer back and say that you are seeking her help to provide her professional input, otherwise what for. Even if you are a low-cost client, the T still gets something and is supposed to provide for it, a client does not need to adapt to a Ts preferences completely. Being assertive like that might even boost your self-esteem a bit