The reversed Nine of Wands tells us that the current situation is not good. The card represents a moment of confusion, of discouragement and can indicate an opposition to today's situation. This means that your ex-girlfriend may face obstacles in her path to success.
The Page of Pentacles shows that your ex-girlfriend has the resources to embark on this journey. The card also represents the personal talent and ability it will take to achieve her goals. However, the card also suggests that your ex-girlfriend will have to try very hard to get what she wants, as there are many other competitors on the market.
The Major Arcana suggests that your ex-girlfriend has a good chance of succeeding in show business, but she must work hard to overcome any obstacles she may encounter. You have enough resources and personal skills to ensure success, but be aware that there is stiff competition. Therefore, the answer to the question is "Yes", your ex-girlfriend can succeed in making a career in show business if she tries hard enough.