Your wife cannot make her breasts pointed. Shape of breasts cannot be changed. Burt she can wear pointed bras which are available in the market. These will make her breast appear to be pointed.
But these may not be comfortable and may make breasts sag in the long run. A woman should wear a bra that is comfortable for her and not care what people want to see.
Just as men have cocks of different shapes and sizes, so also women have different breast shapes. We all know that breasts can be different sizes, but did you know that breasts can be different shapes as well? Some breasts will be bulky, while some may be pointed in shape.
Now, to your point. Yes, pointed breasts can be natural in shape too. But you do get padded bras which can give the breasts a pointed shape. So, it is sometimes difficult to tell whether a woman is using her bra to support her breasts or whether the bra is designed to be pointed for fashion.
A woman cannot change her breasts from a pear shape to perky apples, but she can ensure that the bra she is wearing flatters and contours her breasts in the right way.
Breasts which are perky and pointed will need a little help to maintain a more rounded shape. It is likely that such girls will have a slightly sloping shape to the top of the breast, and her nipples will be pointy and obvious. Generally, such pointed breasts will be smaller in size.