Hi,
Without examination and testing it would be difficult to tell you exactly what is effecting her. If this has recently started it may be depression, anxiety or stress. If this has been ongoing from childhood it could be a mental disorder such as Bipolar.
If your sister is experiencing these types of mood swings she really needs to seek treatment and help. There are many new treatment programs that can help her get past her anger and mood swings if she will only step forward and ask for help. Her first step should be with her doctor he will be able to speak with her and refer her somewhere if need be.
Walter
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