I'm sorry for the hurt, justnothing. It's ok to feel how you're feeling. It does make sense to me.
If I'm reading you right, your mother wasn't a bad mother overall, nor was she a great one. No matter what kind of mother she was, your feelings are valid. We're hardwired to love our mothers, so it's natural to feel as you are.
Every time I go there, the first word that comes to mind is "sorry". I think it might be about not having been sufficient enough. Even as I write this I feel guilty about writing this because if she could read this she'd feel guilty about "making me feel this way" which would mean that she was a "bad mother" which would mean that I made her feel bad by making her feel guilty and ah-ha; I feel guilty for the last part of that sentence too… and no, it never ends.
You aren't hurting the memory of your mother by acknowledging both the good side and the bad side of her. You are remembering her as she was, your mother, whatever that means for you. The grieving process is hard, but I firmly believe that you are a good person. You don't have to be sorry for being you or for accepting the truths you know.
Sending you much caring and support, and offering my condolences and sympathy.