Sister-in-law ignores her husband's family.

This question depends on your relationship with your sister-in-law and the way you expect to communicate. If the relationship between you has always been good, and this time it is only a brief indifference, then you can try to talk to her on your own initiative, and it may just take some time to deal with some personal problems or emotions.

However, if your relationship has been having problems, or you think she may have any dissatisfaction or resentment against you, it is best to give her some space and time to deal with her emotions first. Respect her personal space and time, and remember that people sometimes need to be alone.

In addition, you can consider understanding the reasons why she ignores you through other family members or friends, which may help to better understand her attitude and possible solutions. But in any case, keeping calm and understanding is the key to deal with this situation.