I don’t know if it’s pregnancy hormones and I don’t know what to do.

For starters, I take her out as often as I can but no one else takes her out. She will go to the restroom in the living room. I have to clean this almost daily. I try to leave her outside most of the day but she always finds ways to get out of the fence, she we go under the fence, between the fence, and dig holes under it. I have tried to block off any areas she can get out multiple times and she just keeps finding new ways. I can’t change the fence because we rent the house we are in. She constantly barks at everyone. Then, when she gets out she tries to bite everyone. She is a Chihuahua. I’m so sick of chasing her around and cleaning up after her when I’m doing everything I can to prevent what she does. She also isn’t friendly with my kids. She wants to sleep in their bed with them but wants nothing else to do with them. My kids have been rough with her they are about to be 2 and 3 but they have grown out of it and I’m always there when they pet her. My youngest was petting her gently last night and she snapped at him and snipped his face, he cried and it bled a little. I’m just so tired of her, she’s just become a problem. I feel guilty for feeling this way about her because I’ve had her 7 or 8 years but I don’t want her anymore. Is this the hormones? I don’t want to give her to the shelter but I don’t know who else would want her. She is 12 or 13 years old.