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In my opinion, as long as you explain the reasoning behind these emotions, it will work. For example, go into detail about what she thinks are the worst case scenarios – both if she keeps the secret AND if she shares it. This will drive home the inner battle. Rather than just saying, “she’s having mood swings,” talk about the physical sensations (e.g., heavy weight on her chest, nausea, etc.) and the thoughts. Really emphasize the thoughts and specific worries that lead to the emotions. Sometimes, it’s easier to relate to the thoughts  and physical sensations (e.g., “her throat went dry”) than emotion words (e.g., “fear” or “loneliness”). Drive home what all is at stake: make us really care about the protagonist as well as her loved ones. The more we love her & her loved ones, the more we care about them not getting hurt. Her love for others (and her own life) are what makes her emotions justified. Show WHY she loves her sister so much, WHY she wants to live – the specific dreams she has.

Also, you could try exploring her backstory. That might explain why she gets so upset about these things. For example, what specific difficult events from her past make this situation even more painful? What insecurities & fears already lied inside of her before she discovered the secret?

I hope this helps! 🙂