Solid footing for ladies By John Powers, Globe Staff, 1/11/2002 LOS ANGELES - She was the invisible woman last year, sitting in the FleetCenter stands with her aching back. Out of commission, out of view. Yesterday afternoon at Staples Center, Sasha Cohen made a reentry worthy of a diva, skating a lyrical short program at the US Figure Skating Championships to put herself in reach of Olympus. ''It was a great skate for me,'' said the 17-year-old Cohen, after she placed second behind five-time champion Michelle Kwan and ahead of last year's world team members Sarah Hughes and Angela Nikodinov. ''A really pleasing performance. I don't think I could have done any better.'' It was an extraordinary day all around, with the top nine women all skating cleanly and three of them getting first-place marks. So tough was the field that Jennifer Kirk of Newton, Mass., who was fourth last year, was sixth. ''I did exactly what I wanted to do,'' said the 17-year-old Kirk, who hadn't competed in an individual event since early November because of foot tendinitis. ''I'm so happy with myself right now.'' Happy, too, was Kwan, who cruised coolly through her program and earned seven first-place marks, including seven 5.9s for artistry. ''Just to do a good performance is very satisfying,'' said Kwan, who'll become the first woman since Gretchen Merrill (1943-48) to win six titles if she prevails tomorrow night. ''There's things I could make a little better, a little stronger.'' Barring a multitumble disaster, the four-time world champion figures to continue her reign. But the battle among the ladies-in-waiting for the other two Olympic spots will be fierce. Hughes, the global bronze medalist, and Nikodinov, who has made the last three US teams, figured to have them locked up when the week began. But Cohen, who was second to Kwan in 2000, emerged from the shadows with a graceful effort that evoked the Bolshoi. The judges, who hadn't seen the ballerina's daughter skate that well in two years, had her everywhere from first to fourth. When she ended up just behind Kwan overall, nobody was grousing - not even Hughes. ''I'm pleased with my performance,'' said the 16-year-old Hughes, who thought she skated her best short of the season. ''I couldn't have done any better.'' Even coach John A.W. Nicks, who's frequently exasperated by Cohen's blend of steel and mercury, was happy to give her general absolution. ''When my young protege, the beautiful Miss Cohen, skates like that, all is forgiven,'' he declared. ''How much is there to forgive?'' Nicks was asked. ''You have no idea,'' Nicks replied. ''You have no idea at all.''