Thomas Kinsellas "The Tain" is possibly a bit too.....But Wonderful stuff..
Medb addresses Fedlim the Prophetess as her army sets out to steal the Brown Bull
" Fedlim, Prophetess, How seest thou the Host"
Fedlim " I see it Crimson, I see it red
Death and destruction fall on your army
the Crazed one the Warped one
dealing death and harsh wounds
three spears in his hand
death in his eye
slaying all before him
in a warp spasm"

Lady Gregorys, " Cuchullain of Murthemne" may be a bit Florid of language, but not as good as Kinsella.
The Trouble is that Medb is such an unmitigated BITCH !! that if you find a "cleaned up" story it is likely to be almost meaningless!!!! and not very interesting, especially since the whole premise of the Tain is started by the "war between the sheets" when Medb compares here possessions with Alill, her Husband (NOTE!! NOT the KING! but her Consort)and the only thing she doesnt and cannot match is his White Bull Finnabhair, this causes her such a fit of anger she sets out with her ENTIRE Army to Borrow (or steal, if it will not be lent) The Brown Bull of Cooley.
On the other hand you could get the child a copy of the Horslips CD called "the Tain", it includes "Queen Medb's march"