If there are moments that bother you, then this is a very bad sign. In this case, you should not invest in such a project. In addition, now most projects are scammers. And this one as well.
Tell your sister not to risk her money in a big scam project which is very obvious even in the first place. Stay away from this kind of project before it can steal all the assets of your sister. There are still good and potential projects out there that are likely legit and not like this one who is really a big scam.