Concerning Miriam, she did have a God ordained ministry - to WOMEN:
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Exo 15:20 KJV) And Miriam the prophetess, the sister of Aaron, took a timbrel in her hand; and all the women went out after her with timbrels and with dances.
When she sought to usurp authority from Moses, a man, she was struck with leprosy:
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Num 12:1 KJV) And Miriam and Aaron spake against Moses because of the Ethiopian woman whom he had married: for he had married an Ethiopian woman.
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Num 12:2 KJV) And they said, Hath the LORD indeed spoken only by Moses? hath he not spoken also by us? And the LORD heard it.
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Num 12:3 KJV) (Now the man Moses was very meek, above all the men which were upon the face of the earth.)
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Num 12:4 KJV) And the LORD spake suddenly unto Moses, and unto Aaron, and unto Miriam, Come out ye three unto the tabernacle of the congregation. And they three came out.
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Num 12:5 KJV) And the LORD came down in the pillar of the cloud, and stood in the door of the tabernacle, and called Aaron and Miriam: and they both came forth.
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Num 12:6 KJV) And he said, Hear now my words: If there be a prophet among you, I the LORD will make myself known unto him in a vision, and will speak unto him in a dream.
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Num 12:7 KJV) My servant Moses is not so, who is faithful in all mine house.
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Num 12:8 KJV) With him will I speak mouth to mouth, even apparently, and not in dark speeches; and the similitude of the LORD shall he behold: wherefore then were ye not afraid to speak against my servant Moses?
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Num 12:9 KJV) And the anger of the LORD was kindled against them; and he departed.
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Num 12:10 KJV) And the cloud departed from off the tabernacle; and, behold, Miriam became leprous, white as snow: and Aaron looked upon Miriam, and, behold, she was leprous.
She indeed have a ministry to women and when she stepped out of that ministry into a mans ministry the anger of God was kindled against her...