Please Advise this Woman

A woman (who I know) was given some money to hold by her husband (who happens to be a businessman) before he went on a business trip. He instructed his wife to hold the money for him so that he could use it upon his return. Shortly after his departure, the woman's sister came to her asking for some money to help complete an office project. Conscious of her promise to her husband, the woman told her sister that she had no money. 

Despite this, her sister continued to beg and goad her. The woman decided to help her sister by giving her husband's money under the condition that she would pay back as soon as the project was completed. Finally, a week later, the woman called her sister and asked her about the money but her sister said to call her back in a few days. After a few days, the woman called again and this time her sister began complaining that the project had failed and that she'd lost her money.

Now, with the money gone, the woman is confused, angry, and uncertain. She suspects that her sister's husband (who is also a businessman) might have taken the money and put it into his business. Just recently, the woman's husband flew back into the country and is currently in the East. According to her, her husband has made no mention of the money, but she's afraid that he might ask her to bring it with her to meet him in the East.