You need to make sure you apologize for reading her texts but acknowledge you do it because of past issues you have had. I assume she knows about them? Communication is important and if you feel you can't speak freely that should be addressed.
It is also possible she feels bad for not liking your family and has always wanted to say something but was scared that you would get really upset with her. If you do have a good relationship I would guess she feels guilty and also might be wanting more communication. You have to approach it with an attempt to understand her feelings and position as well.
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