Anyone else have a mother-in-law like mine? How do you cope?

So - I have this mother-in-law. My husband does not like her and avoids her and somehow that is my fault. She does not want to believe he really feels that way... So she chooses to believe I don't want him to have anything to do with her. He told me he avoids being around her ON OUR FIRST DATE... So I don't think it is me. She only contacts him to borrow money, whine about how miserable she is, tell him what she wants for Mother's day, Christmas or her birthday (she usually emails a list). She won't come over if I invite her - but them whines that she never gets to see her grandkids. She lives 15 minutes from us. I can't take my babies to her house because she refuses to put up her dog "her baby" who has bitten several people... Including my son from my 1st marriage. She said that her dog bites when he "senses bad people" - that was my (at the time) 9 year old son who was casually walking thru her living room ignoring the dog. Dog just ran up and bit his ankle. She is married but asks to borrow large sums of money and tells us her husband can't find out because he will get so mad that she fears for her safety. If we don't lend her money, she calls my husband selfish and says his father (who is dead) would be ashamed of him for not giving her money she needs. She does not work or anything but when my baby was born she never offered to come help even tho she knew I was recovering from c-section and having to take care of a 4 year old. She stopped by once for an hour (unannounced) and just whined about her problems and glanced at the new baby and ignored my 4 year old who was begging for her attention - then has the nerve to contact me the day after grandparents day wondering why she didn't get anything from us. She made a commitment to babysit for us a few years back but wanted $800 pay upfront for a bill she needed to pay. She quit sitting a week after we gave her the $800.