My daughters is 10years and 3 months. her recent cycles have been irregular and during her last 2 periods she bled excessively. is this normal?

Not uncommon: During the initial year of cycles young women often do not release eggs, which is an important point in creating regularity by triggering release of a pacing hormone. Without this cycles are estrogen dominated and build until womb tissue until it sheds, often with prolonged or heavy cycles. You can wait it out and it should normalize or she could go on the pill to pace her system.