Alhamdulilahi.
There is no blame on a person, man or woman, for calling off an engagement, because engagement is a non-binding promise. However, it is disliked (makrooh) to call it off for no reason.
Many scholars agreed that It is not makrooh "disliked" for her to change her mind if she decides that she does not like the suitor, because marriage is a contract that will last a lifetime, so she has the right to be prudent and err on the side of caution.
If they decide to call it off for no reason, however, that is makrooh "disliked" because it is breaking a promise and going back on one’s word, but it is not haraam, because there is no binding commitment. That is like one who offers a product for a price, then decides that he does not want to sell it.We should point out about that the fiancé is still a non-mahram to his fiancée so it is not permissible for him to be alone with her or to touch her or look at her, except a look for the purpose of deciding whether to propose to her only.And Allah knows best.