The skill-set I chose is admittedly most suited for planet-side missions; I was thinking the character could have a number of uses on planets, stations or in away missions in enemy ships- scouting behind enemy lines for the friendly military force, sabotaging equipment and vehicles to reduce enemy opposition, attempting to assasinate enemy commander's or other VIP's whilst trying not to get killed in the process in order to cause enemy confusion. Infiltration of fortified areas for the purposes of data extraction, planting false information or sabotage, or maybe helping to rescue captured personnel, etc kinda sounded like fun. Plus, as you noted there are few if any other characters of the type around (not that I noticed anyway. The player character I spotted was Helen Klein, and she seems more geared towards being an Intelligence Officer / Interrogator sort of character rather than a field operative). There's quite a few uses a ship captain could put Reika to if it came down to it. Though just because she's trained to do it, doesn't mean she'll perform perfectly in the field (how often does a mission ever turn out 100% how one expects?) and the GM's are always free to add little problems or impediments to Reika's tasks to make things more interesting, difficult or flat-out impossible so that she'll have to back off.
Reika does have some but not all of the skill-set that would probably be required of an Intelligence officer; mostly information retrieval via computers and the ability to code and decrypt information. She doesn't have the Leadership skill that would be needed to fully qualify her for a position as an Officer (required for making tactical analysis's using available information and then making recommendations to the ships commanding officer, etc. Plus as a new character, I don't think she has the rank to be an officer of any kind)... but that's perhaps something the character can work towards down the line.
According to the wiki article, an Operative is expected to perform whatever ship-board duties are required of her; whilst she isn't trained for any specific ship work at present, Reika does have the basic training (Mathematics, Technology Operation, Fighting and Communication) required of all Star Army personnel. Actually, when supplemented by the SAINT training, the skill-set she has probably qualifies her to be able to work in an Information Technology / Information Warfare capacity- to a degree at least. I also don't doubt there's some empty position aboard any ship she could temp for with just a little extra training- she probably won't be perfect, but at least competent enough to get by and not be a burden on everyone (even if its just doubling as a cargo and supply specialist).
BTW Nashoba, I moved the image to be hosted on the wiki instead... didn't know how to do it at first.