1, suppose that Sister Bei is Sharon
So why did she deliberately create a Chris, for Sister Bei, she could only fake Sharon's death and continue to work in the organization (such as what the full moon did, and feeding Mary medicine), why did she fake her daughter to continue to appear in the public eye.
Will it be because she really had a daughter, there is Xizi and Sharon known for so many years, not necessarily once have not seen Pei sister and her daughter appear on the same stage, even a photo, so the New York chapter Sharon mentioned his daughter, there is Xizi did not feel strange, according to their conversation at that time, Sharon said "after handing her voice change and disguise, I have not seen her for 10 years", will it be that time, Sister Bei stopped aging, and Sharon really daughter Chris died at that time?
2, Sister Bei's hatred with a drug
If Sister Bei is the daughter of the boss or a family relationship, from the degree of pampering of the boss to Sister Bei (by organizing other people's evaluations, as well as the text message of the full moon), I do not think that the boss will let Sister Bei eat the test product of the drug, then it may be that Sister Bei took the initiative to eat.
Why Sister Bei will take the initiative to take this drug that is still in the experimental stage, indicating that she can't wait to prove the effect of this drug for someone, from the gender point of view, she should also replace a woman, maybe it is Sister Bei's daughter Chris something happened, she wants to save Chris. From the point of view that Sister Bei can sacrifice herself to save Conan Xiaolan, this hypothesis is true.
Perhaps the drug in dr. Miyano's stage, although it can make BeiJie's appearance suspend aging, in other words, save her life, but it may be that Chris died in front of Beijie after taking the drug.
At present, according to my understanding of Sister Bei, I think she will not compromise on taking medicine, nor will she be forced, the only possibility is to take the initiative to eat, Sister Bei is after all a girl, it may be that the family has an accident, according to gender, family blood, relatives to do the feasibility of test products is slightly higher.
People who can let Sister Bei's self-reliance stay in the organization to sell their lives (after all, Sister Bei is still serious most of the time when she does tasks
I think the relationship between Sister Bei and the boss should be the relationship of family.