No idea of the same watch in smaller size. However you can look for other similar style classic dress watches.
If you don't mind other brands, give a look to Orient. The brand usually have good prices and is available almost everywhere from mall-stores, to district jewelries to small and big online shops. They're good watches quality-price wise, and they have some of the models available in 30, 32, 38,39,40, 41 and 42 mm. However the smaller models are a bit different than the ones 38mm and up usually, and the affordable ones in dress style come without sapphire and with bad bracelets. The normal basic dress Orients are far cheaper than the SARB, and another segment. But there is also the Orient Star line, some models are in the same price range as the SARB. Stars have a much better finish than the normal Orients, sapphire and decent bracelets in dress style, but the models in 30,31 and 32mm are different from the ones in 38mm and up. The Orient Star contemporary series open heart have a similar shape to ones you like, very good quality dials and there are some models in 30 and 30,5mm. For example red dial RE-ND0102R is 30mm.
If you don't mind waiting time for shipping and looking in Chinese brands, you could give a look to Sea-Gull (usually their own designs and in house movements unlike other affordable Chinese brands that just homage Japanese and Swiss watches), they usually are good for the price, including sapphire and decent bracelets. They have kits of several dress watches matching, however they are usually a 40mm/41mm one paired with a 32mm. Probably you prefer a 38mm for yourself, but they have interesting watches to look for sub-38mm size. The style of the cases is usually more rounded and different from SARB, but if you're looking for a 32mm women dress watch with applied indices and simple design without jewels, etc, they have some variety. For example a interesting classic dress watch with white dial is the model 816.421L, the normal 816.421 is 41mm, but the L version/variant is 32mm, the price is about 330 or so, but it can be found far cheaper at Chinese new year (in just a few days) or 11/11 sale.
Also you can give a look to a smaller unisex watch than the SARB in a similar style. For example the Lorier Falcon II is very interesting and it is a 36mm watch, but probably still too big for her if you prefer 32mm. Anyway you can give a look to it, it cost about 500 and it have very nice case and unique high quality dial with a variety of color combinations.
