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“Matt Slick, writing on the website of the Christian Apologetics & Research Ministry, goes into great detail with material from Roman Catholic sources that say Mary is “the all holy one,” is to be prayed to, worshipped”

People can say/write/blog that all they want until the end of time, and it still will be a false statement.

(it would improve your case if you'd actually DEAL with the SOURCES; don't you think?)

Please consider the following quotes from official Roman Catholic sources.

You decide for yourself if a kind of worship and adoration is given to her that should be given only to God.

Mary is the all holy one: "By asking Mary to pray for us, we acknowledge ourselves to be poor sinners and we address ourselves to the 'Mother of Mercy,' the All-Holy One," (CCC 2677).
Devotion to Mary: "The liturgical feasts dedicated to the Mother of God and Marian prayer, such as the rosary, an "epitome of the whole Gospel," express this devotion to the Virgin Mary," (CCC. 971).
Pray to Mary: "Mary is the perfect Orans (pray-er), a figure of the Church. When we pray to her, we are adhering with her to the plan of the Father," (CCC 2679).
Mary is worshipped: "...when she [Mary] is the subject of preaching and worship she prompts the faithful to come to her Son..." (Vatican Council II, p. 420). See quote in Context
No Better way than to look to Mary: "After speaking of the Church, her origin, mission, and destiny, we can find no better way to conclude than by looking to Mary," (CCC 972).
"so no man goeth to Christ but by His Mother," (Vatican Website: Encyclical of Pope Leo 13th on the Rosary, Octobri Mense, Pope Leo 13th, 1903-1914).
Mary brings us the gifts of Eternal Life: Mary, "...by her manifold intercession continues to bring us the gifts of eternal salvation...(CCC par. 969).
Mary made atonement for the sins of man: "...Mary, by her spiritual entering into the sacrifice of her divine son for men, made atonement for the sins of man and (de congruon) merited the application of the redemptive grace of Christ. In this manner she cooperates in the subjective redemption of mankind." (Fundamentals of Catholic Dogma, Ott, page 213).