When you first take your foster cat home, take care not to overwhelm her with too many new experiences all at once. Moving to a new environment is stressful in itself for many cats, so keep introductions to people and animals to a minimum during the first couple of weeks after you bring your foster cat home. It also helps to establish a daily routine of regularly scheduled feedings and play times.
In addition, on a daily basis, be aware of your foster cat’s appetite and energy level. If she’s not eating well or seems listless, something may be wrong medically. You might want to record your observations to make it easier to notice any health issues.