Will Chista ever earn enough to upgrade her gear?
Hmm... probably not. Not just because Chista is both bad with money, and has so many fees and fines levied on her by her Guild due to all the "collateral" (I.E. party members eaten, wrong bounties digested, and random people that fall prey to her appetites) that saving up is a little difficult for her.
Also Chista doesn't feel that she needs to improve her gear.
Currently Chista wears a mix of mundane and magical light armor. Her jacket and pants are both made from fire silk (which, for DnD terms, is padded armor +1) which provides decent protection, but she's reinforced that with leather armor. Not the highest quality leather, as its more of a hodgepodge she's slapped together from what she's found in the field. Overal that's decent protection and to go higher would require getting fitted armor or having her current outfit made with more exotic materials.
She has a decent pistol, and a good selection of (lesser) potions of healing, anti acids (of questionable quality) and a couple digestion enhancers. In her backpack she has the usual tools of the trade (Rope, pitons, crowbar etc.) All together she's pretty well stocked and fitted for Adventure!