Antiques bizarre / Barbara Allan.

Enhanced descriptions from Syndetics:

Brandy Borne knows the outcome of her mother Vivian's plan, however, is more likely to lean toward bizarre, especially when she hears Mother wheedle a reclusive Russian heiress into donating a truly rare item: the last Faberge egg ever created! As private bidders and representatives from Christie's and Sotheby's go at each other, and local-theatre diva Vivian barks her way into auctioneering infamy, Brandy tries her best to stay calm-all this craziness can't be good for her pregnancy (did we mention she's surrogate mum for her best gal pal?). It's not so good for the winning bidder, either, who turns up mortally scrambled at the foot of a church-tower staircase¿without the prized egg. Soon no one is safe, everyone's a suspect, and even the thought of food is sending the now Prozac-free mom-to-be sprinting for the nearest porcelain altar. It's going to take a little fuzzy therapy from Sushi-Brandy's peppy Shih Tzu-and a lot of Mother's charmingly, alarmingly meddlesome inquiries to track down this killer¿who is one seriously bad egg!