The attorney for a former Sacramento mayor's aide accused of misusing her city-issued credit card says some of the charges on the card appear routine and others may have ended up there by mistake.

William Portanova made the comments on Wednesday after his client, 40-year-old Lisa Serna-Mayorga, made her first court appearance on charges of misappropriating public funds, grand theft, forgery and writing bad checks. She did not enter a plea.

Serna-Mayorga is accused of improperly charging about $19,000 on the credit card between July 2009 and June 2012, including a trip to Disneyland, restaurant bills and hundreds of iTunes purchases.

Portanova said the restaurant charges appear to be routine. The larger purchases may have wound up on the card by mistake.

Serna-Mayorga served as office manager to Mayor Kevin Johnson and the Sacramento City Council. She resigned in July.