I agree with above posts... don't handle her too much unless gently moving for cleaning, etc. Do NOT feed her too much during pregnancy, feed half as often as usual and half-size her normal meals only... sometimes a gravid boa will even refuse food. Be sure to stop feeding around the last month before she is thought to birth her young... otherwise, when passing her waste she may prematurely have her babies.
My very sweet redtails even get testy after birth, instinct is to protect their young and of course, they will be hungry afterwards. I carefully remove babies after they are moving around on their own (respectfully avoiding angry Mom) and then feed her a normal sized meal. My last litter I removed a couple hours after birth, while using her meal to distract the mother from my taking the nest box. After eating and a day or two of digestion, she should be back to normal.
Babies should have shed at least twice, and eaten quite a few meals, for me to consider them 'established' enough to sell or go home with someone. I want them strong and healthy for their new life, and also, so that I am not responsible for someone elses mistakes if the baby passes away. At least it was a strong, 100% healthy baby when it left my care... and I guarantee it because that is what makes me (or you) a good business person and overall breeder. Oh and personally, I don't feed them until after they've shed once if possible, because I fear that the area on their belly where the cord/sac was attached (and eventually fell off) may be too tender and tear if I feed them too early after birth.
Good luck, if you haven't had boas before, I would do a little research and get opinions on caging, temps, etc. General husbandry practices, so that you get a healthy litter right off the bat. Too hot or cold can lead to premature, stillborn, or deformed young... as is similar with ball pythons I'm sure ;p
There are people here that can give you more precise answers... this is what I've learned from my experiences. I hope this helps!

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Steph S.
Boas...
1.1 Albino boas (Loki & Hope)
1.4 07 Het. albino boas (Petty & Lady,Sierra,Madeline,Lola)
0.1 Reverse stripe poss. het albino (Cookie)
0.1 Salmon/hypo (Scarlet)
0.1 Anery poss. het snow (Missy)
1.0 Anery (Reno)
0.1 DH Sunglow (Bonnie)
1.0 Het. Anery (Guy)
0.3 Normals (Ophelia, Sasha, & Lulu)
1.1 Surinames (Solomon & Surreal)
1.2 Hogg Isles (Mr.Orange & Peaches, Apricot)
0.0.1 Central American (Sassy)
0.1 Emerald Tree boa (Jade)
1.0 ATB (Satan... seriously!)
Pythons...
2.1 GTPs (B., Monty & Jewel)
0.0.3 BPs (MJ, Precious, Houdini)
1.1 Carpet Pythons (Jackson & Charlotte)
0.1 Blood python (Akaia)
Misc.
1.1 Mandarin Ratsnakes (Jack & Jill)
1.0 Boxer/Pitt Mutt (Tyson)