Does bpd makes it tough to not cross a boundaries? 

I had gf for 2 years. She has bpd and she lives with toxic family. 

We had many ups and downs. I noticed that sometimes its easy for her to lie or cross my boundaries. Is it normal for people with bpd?

She made some changes in her behavior. She doesnt lash out at me, she respects that I need some space. But sometimes she lies to me and cross my boundaries.

So I need advice is it normal that she needs time to process my needs and stop crossing my boundaries or it will never change? 

Everytime when I know she lied or crossed my boundaries she felt really bad about it
.