I very much doubt Chelsea knows who BEShine is. Even if she did, I very much doubt it would have any impact on her whatsoever. For many years now Chelsea has marched to the beat of her own drum, frequently turning down offers and opportunities that most girls would have jumped at, because those things did not fit her vision of how she wants her life to be.
If Chelsea were competitive she would have challenged Maxi Mounds Guinness Record, but she doesn't think that way. If anything the increase in BEShine's size would leave Chelsea delighted to have another Mega busty girl out there.