The menstrual cycle is the reproductive cycle, as long as she is fertile she is always on her menstrual cycle. You can't tell where she is in her menstrual cycle unless she tells you.

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The typical menstrual cycle is 28 days, but it is considered to be normal as long as it is +/- 7 days of this, as long as the spacing remains constant. Though it should be noted that women may have irregular periods for the first few years, and the last few years of their reproductive life.

The menstrual cycle starts with menstruation. The firswt day of your menstrual cycle is considered to be the first day of true bleeding during your menstrual phase.

The menstrual cycle is the whole reproductive cycle, I think maybe you mean the menstrual phase. The first day of menstruation is day one of your menstrual cycle, ovulation typically occurs around 14 days into the menstrual cycle - although everyone is different.