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We present NLTE abundances and atmospheric parameters for three metal-poor stars in Coma Berenices UFD, based on photometry from the 2.5-m telescope of the SAI MSU Caucasian observatory and spectra from the archive of the 10-m Keck telescope. Three stars show chemical abundance patterns that differ from each other and from those observed in MW halo stars of similar [Fe/H]. A spread of 0.65 dex in [Fe/H] is related rather to inhomogeneous mixing of interstellar medium than to an increase in [Fe/H] due to prolonged star formation