So, my DH and I have been thinking for awhile that a good way to save money that works for us, is to just have a Pack N Play and use that for the baby to sleep in instead of buying a traditional crib. Not only are we both terrified of putting a crib together ourselves (and if you have ever seen our IKEA couch and coffee table, you'd understand our fear

), but we do a lot of traveling to visit family and friends, and I'd like to still be able to do that even after the baby comes. So to me, a Pack N Play is the perfect solution since we can just toss that in the car for my DD to sleep in when we travel.
Well, my sister asked us when we were going to purchase a crib and I told her that we probably weren't, we were thinking about just purchasing a Pack N Play. She was stunned, and not in a good way. She said that it is a "bad idea" and that I was being "cheap" and that if I couldn't afford a traditional crib, maybe she should be concerned that we'd have enough resources to raise the baby. Then she said "Well, I guess I could buy one for you." And I told her that we were still considering the idea, and until we made a decision about it, I'd rather she didn't, and if she wanted to, she could put the money on a gift card. But THEN she said that it didn't sound like I was making good decisions and she didn't know if anyone should trust me with such a large amount of money (like $150 or so). We also preceeded to argue about other stuff, one of the issues being whether DH and I should have more children (she thinks 1 should be enough for us, EVER, even though she doesn't have a good reason why. And DH and I want at least 4, though not all at once).
Anyway, all this all happened about 2 weeks ago when she came to visit us. I didn't tell my DH what she said, and thank God, because he already hates her b/c he thinks she's controlling and she looks down her nose at everything (which is very true). So, last night, we were at Target price checking some things, and he saw this Pack N Play that he really likes and said this is the one he wants to get since we can reuse it for all the kids. And I said we should talk about it more and he asked why, and I said, I just wonder if we should get a crib. And then he got mad and asked me what my sister had said and that he knew she must have said something b/c I was all for the idea before.
Obviously, I have issues with my sister. She is the only one of my siblings that even talks to me, really, and it's hard for me to push her to the back corner of my life like the others, even though DH wants me to, and in all honesty I probably SHOULD. I hate that she is always "worried" and "concerned" that DH and I will be able to take care of the baby, and I just wish she would stop telling me how worried she is b/c I have complete faith in my DH and myself to provide a great home and great care for any children we have and I'm tired of everyone doubting us just b/c we don't have a million dollars. But I know that's something I have to work out with her myself.
My question (and thanks for reading such a long post) is:
Am I a "Bad Mommy" if I use a Pack N Play and just not buy a crib?