If I text my girlfriend and ignore you, how can I make her ignore you?

Give her some time. She's obviously angry with you. See if you are not doing well, and you have to change it later. The faster way is to give her a day to calm down, then surprise her with a bunch of flowers, then tell her "I won't make you angry in the future", and then arrange an appointment. Love cannot be compelled. If she is determined to change her mind or something, then break up.