Hello Ashish,
Your sister's result is average. However she may or may not get admission in GGSIPU as competition is rising each year. Last year cut off was within 1200 rank. So there is less expectation. However with SC caste it may be possible to get admission in GGSIPU in BSc Nursing. All the best!
For more information you are required to download previous year's details from official site: http://www.ipu.ac.in/pubinfo/admission2018/adm2018notices/cutoff2017as210518.htm
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