Just based on the information you have given, it sounds like April isn't going back to the Witnesses because she thinks it's "the truth" but because she only wants to be with her family. (completely understandable) She's remembering them and her life as a Witness from memories that are 20 years old and is likely seeing things through rose colored galsses, which tends to happen with the passage of time. Who knows, maybe after 20 years, her parents have improved, they are the only ones she has and sometimes you have to take what you can get. If she is able to go back and have her sisters in her life again, yet keep her perspective about this religion and glean what she can from it, maybe it will help her through this difficult time. I know people who are on what I call the "JW My Way" plan. They decide what they do and don't beleive of the JW doctrine. They decide how much or how little they participate. They choose to be in it because it provides a means for them to feel a part of a group of for some other personal reason but not because they think JW's are the absolute universal truth out there. They are not sentimental about it, it simply serves a need they have. Their relationship is with God, and are only JW's because they happened to be the religion they were raised in or happened to become involved with at some point.
After one's life is tangled up in this religion, they sort of have to navigate their way to some sort of normal, any way they can. If April can't see her family any other way, maybe she can fight fire with fire until she makes what she deserves to have happen, come to pass.
One thing is for sure, she is not alone. It's unbeleivable how many lives and whole family lineages have been disrupted or permanently altered by this organization. I've been out for about 4 years, I swear not a month goes by where I don't hear about another JW acquaintance who is leaving, has left or is being shunned. I just happened again today. I don't know how they can survive as an organization if this is happening everywhere.