To: MC
I can say only, that if the cosmetic surgeon will add more strings into your current implants, it will provoke the next stage of your breasts growth, and the 50' level of your breasts size will become the history very soon.
That's why, if you really want to stop on the 50' level, IMHO it will be better to wait about 3-5 months more and not to make the new improvements now. Because the process of growth for this type of implants will continue during your whole life. This is a well-known fact.
If no, - "More stings - more growth",- Chelsea Charms manifests it with evidence.
PS Hope that all is Ok with your mother.