The reversed King of Swords indicates that Rita's mind is not focused on marriage right now. She may be distracted by other plans or simply not attaching enough importance to marriage. On the other hand, there are obstacles that need to be overcome, which can lead to a situation of uncertainty or confusion.
The reversed Ten of Pentacles suggests that Rita's body may not be ready for marriage. There may be some physical problem or she may be afraid of the complications that a marriage can bring. Also, there's a chance she's concerned about the financial consequences of getting married, such as the economic stress it can cause.
The reversed Eight of Cups highlights that Rita's soul is not yet ready for marriage. There may be emotional blocks or doubts about the relationship or compatibility with her partner. Also, there may be a risk of a past suddenly recurring and trying to interfere with her plans for the future.
Based on these tarot readings, it appears your sister Rita's marriage isn't set to happen anytime soon. There are still some hurdles to overcome both mentally, physically and emotionally that need to be addressed before she can make a final decision. Therefore, between Marriage of Rita and Marriage of Maria, Maria is more likely to marry before her, as she seems to have fewer problems to deal with before making a final decision.