Yes if she is going back and planning to come back here, she will need a ktkln card. She can either apply it on her own back in Indonesia (if she is savvy enough) or you can make a trip to batam to apply for her.
This website have some tips on how to apply for it in batam. You can check it out
https://wahliang.wordpress.com/tag/e-ktkln-card/
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