Since the Calla lilies have been producing seed, not much energy has been returned to the bulb. If you want to recover, store and regrow the bulbs, you must cut off the flower stalks as soon as the bloom is finished. Personally I have not had much success with this. I have stored and then potted the bulbs in the early spring and they were actually flowering indoors, but after hardening them off and planting them outside, I had lovely foliage but no further blooming. It sounds like your mother wants to continue growing the plant rather than harvest viable bulbs. She could bring it indoors and try to give it similar lighting and moisture, but she will likely find the plant will decline, particularly as it has spent its energy producing seed. Good Luck!
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