I forgot to add that since you mentioned the Shield. That is my current CC and it is harder to rack than either the Sig P238 or the HK P30 for my wife. Again the Shield is striker type rather than an exposed hammer. For what its worth the HK P30 has a decocker and is DA with it de-cocked and chambered and SA when its racked or you pull the hammer back. It is a double stack so it's 15 + 1 but may be too wide. The P238 is .380 and a single stack so fit may be better and recoil is fairly easy.
As we keep saying though put them in her hands and let her try them out.